Unit 3 - Test Prep -- extra practice problems Answer Key!

p. 148 Oral Exercises

#2 -st² and 3t²s; 2s²t and –s²t

Like terms are terms that have the same variable(s) and exponent(s). 

#5 degree 8 (Add the exponents of all the variables.)

#7 degree 3

#9 degree 6

#12 -4x³ – 2x² + 6x – 5; cubic four-term polynomial

#14 p²q³ – 3pq⁴; degree 5 binomial

#16 -s²t² + 2s²t + 3st²; quartic trinomial

p. 149 Written Exercises

#43 2a³ + 2ab² + b³

pp. 153-154 Written Exercises

#20 -3r³s⁶

#34 0

To multiply monomials, multiply the coefficients, keep the same base, and add the exponents.

p. 157 Written Exercises

#16 16t¹⁶

#28 10x⁹y⁷

#48 8x⁸ⁿ

pp. 159-160 Written Exercises

#17 2x⁴ – 3x³y – x²y²

#40 Area = 2x² + 5x units²

pp. 162-163 Written Exercises

#16 10k² – 11k – 6

#34 -2a³ – 5a² + 11a - 4

p. 177 Self-Test 3

#3 The dimensions of the pond are 17 ft by 10 ft.