Algebra 2 Expressions, Equations and Models Worksheet with Answers – PDF

Algebra 2 Expressions Equations Models Worksheet: problems 1–5

1. Parts of an exponential model

The value of Priya’s savings account is \(B=800(1.03)^{t}\) dollars, where \(t\) is the number of years since she opened it.

1. Identify the starting amount.
2. Identify the growth factor and the yearly percent increase.
3. Explain what \(t=0\) tells you about \(B\).

2. Terms and coefficients

Consider the expression \(5x^{3}-2x^{2}+7x-9\).

1. List the terms.
2. Name the coefficient of each term that contains \(x\).
3. Name the constant term.
4. List the factors of \(3(x+1)(x-4)\).

3. Meaning of a factor

A school store sells spirit T-shirts at \(p\) dollars each. The number sold is \(500-20p\), so revenue is \(R=p(500-20p)\) dollars.

1. Identify the two factors in \(R\) and say what each one represents.
2. Find \(R\) when the price is $5.
3. Find \(R\) when the price is $10.
4. Which of the two prices earns more revenue?

4. Write and interpret a cost expression

Ethan buys \(n\) notebooks at $2.50 each and one backpack for $18. Sales tax is 8% of the whole purchase.

1. Write an expression for the total cost in dollars.
2. Explain what the factor \(1.08\) means.
3. Evaluate the expression for \(n=6\).
4. Rewrite the expression in the form \(an+b\).

5. Fourth-power differences

Factor each expression completely over the real numbers.

1. \(x^{4}-16\)
2. \(x^{4}-81\)
3. \(16x^{4}-1\)
4. \(m^{4}-n^{4}\)

Algebra 2 Expressions Equations Models Worksheet: problems 6–10

6. Hidden squares

Factor each expression completely.

1. \((x+3)^{2}-16\)
2. \((2x-1)^{2}-25\)
3. \(x^{4}-5x^{2}+4\)
4. \(x^{4}-13x^{2}+36\)

7. Simplify with structure

Rewrite each rational expression in simplest form and state any excluded values.

1. \(\frac{x^{4}-16}{x^{2}+4}\)
2. \(\frac{x^{2}-49}{x^{2}+14x+49}\)
3. \(\frac{x^{4}-1}{x^{2}-1}\)

8. Factor over the complex numbers

Factor each expression completely over the complex numbers.

1. \(x^{2}+9\)
2. \(x^{2}+25\)
3. \(4x^{2}+1\)
4. \(x^{4}-16\)

9. Quadratic zeros and the Fundamental Theorem

Solve each equation with the quadratic formula and write the quadratic in factored form over the complex numbers.

1. \(x^{2}-6x+13=0\)
2. \(x^{2}+2x+10=0\)

How many complex zeros does every quadratic have?

10. Pascal's triangle rows

Use the part of Pascal’s triangle shown to answer each question.

1. Fill in row 5 and then write row 6.
2. What is the coefficient of \(a^{3}b^{2}\) in \((a+b)^{5}\)?
3. Find the sum of the numbers in row 6. What pattern do you see?

Algebra 2 Expressions Equations Models Worksheet: problems 11–15

11. Expand binomials

Use Pascal’s triangle to expand each power.

1. \((x+2)^{4}\)
2. \((x-3)^{3}\)
3. \((2x-1)^{5}\)

12. Rearrange common formulas

Solve each formula for the variable shown.

1. \(A=\frac{1}{2}bh\) for \(b\)
2. \(P=2l+2w\) for \(w\)
3. \(V=\pi r^{2}h\) for \(h\)
4. \(F=\frac{9}{5}C+32\) for \(C\)

13. Rearrange formulas with fractions

Solve each equation for the variable shown.

1. \(\frac{1}{f}=\frac{1}{p}+\frac{1}{q}\) for \(q\)
2. \(S=\frac{a}{1-r}\) for \(r\)
3. \(A=P(1+r)^{t}\) for \(P\)
4. \(y=\frac{2x+1}{x-3}\) for \(x\)

14. Solve f(x) = g(x) from a graph

The graph shows \(f(x)=x^{2}-2x-3\) and \(g(x)=x+1\).

1. Estimate the solutions of \(f(x)=g(x)\) from the graph.
2. Verify them algebraically.

15. Solve f(x) = g(x) from a table

Let \(f(x)=2^{x}\) and \(g(x)=11-x\). Complete the table, then solve \(f(x)=g(x)\).

x	1	2	3	4	5
f(x)	?	?	?	?	?
g(x)	?	?	?	?	?

Explain why there is only one solution.

Algebra 2 Expressions Equations Models Worksheet: problems 16–20

16. Solve a rational equation by graphing

The graph shows \(f(x)=\frac{6}{x}\) and \(g(x)=x-1\).

1. Use the graph to estimate the solutions of \(f(x)=g(x)\).
2. Write an equation without fractions and solve it to confirm.

17. Garden area model

Mei plans a rectangular garden whose length is 3 feet more than its width. The area must be 270 square feet.

1. Write an equation for the width \(w\).
2. Solve it and state the dimensions. Explain which solution you reject.
3. Fencing costs $4.50 per foot. Find the cost to fence the whole garden.

18. Speed and time model

Liam drives 60 miles on a country road at \(r\) miles per hour, then 60 miles on an interstate at \(r+20\) miles per hour. The trip takes 2.5 hours in all.

1. Write an equation for the total time.
2. Solve it for \(r\) and reject any solution that does not fit.
3. State both speeds.

19. Bacteria growth model

A lab culture starts with 500 bacteria, and the number doubles every 3 hours.

1. Write a function \(N(t)\) for the number of bacteria after \(t\) hours.
2. Find \(N(6)\).
3. Write and solve an equation to find when the culture reaches 16,000 bacteria.

20. Budget inequality

Aisha has $120 for team shirts. The printer charges a $30 setup fee plus $6.50 per shirt.

1. Write an inequality for the number of shirts \(n\) she can order.
2. Solve it.
3. State the constraint that applies to \(n\) and give the greatest number of shirts.

Algebra 2 Expressions Equations Models Worksheet: problems 21–22

21. Farmers market equation

Maya spends exactly $30 at the farmers market on apples at $2 per pound and pears at $3 per pound.

1. Write an equation relating apples \(a\) and pears \(p\) (in pounds).
2. The stand sells whole pounds only. List every possible pair \((a,p)\).
3. Which constraint on \(a\) and \(p\) rules out points of the line with negative coordinates?

22. Cookie box constraints

Ethan sells small cookie boxes (\(x\) of them) for \$4 and large boxes (\(y\) of them) for $7 at a bake sale. He packed at most 25 boxes and wants to earn at least $140.

1. Write a system of inequalities for the situation.
2. Decide which of A, B and C are possible plans.
3. If Ethan sells exactly 25 boxes, what is the least number of large boxes he must sell?

How should you work through these 22 problems?

Start with problem 2, because it names the terms of \(5x^{3}-2x^{2}+7x-9\) and sets the vocabulary. Then try problem 3, where \(500-20p\) counts T-shirts sold. Ask what each factor means before you multiply anything. As a result, later models feel less abstract.

What mistakes appear in factoring problems 5 to 8?

The most common error is stopping at \((x^{2}+4)(x^{2}-4)\) in problem 5. Instead, notice that \(x^{2}-4\) is still a difference of squares. Problem 6 hides another trap: \((x+3)^{2}-16\) is a square minus a square, so write it as \((x+3+4)(x+3-4)\). In problem 8, remember that \(4x^{2}+1\) only factors with complex numbers.

Problem 7 adds excluded values. For \(\frac{x^{4}-16}{x^{2}+4}\), the denominator never equals zero over the reals. Even so, check it before you cancel.

How do the modeling problems 17 to 22 work?

Each one starts with a sentence you must translate. In problem 17, the garden is 3 feet longer than wide, so the area equation is \(w(w+3)=270\). In problem 18, Liam drives 60 miles twice, so add two time terms. Problem 20 is an inequality, so state the greatest whole number of shirts. Meanwhile, problems 21 and 22 ask for two-variable equations with a constraint.

Finally, try the algebra 2 expressions equations models worksheet a second time without notes, and compare your time.

What comes after the worksheet?

Check your work with the answer key, and mark each missed problem by number. If problems 5 to 8 caused trouble, redo those first. If problems 14 to 16 slowed you down, sketch the graphs again and read the crossing points carefully. Then move on to the chapter test.

See every chapter on the Algebra 2 math page.