Content Review:
- PSAT Math: Exponents and Radicals
- PSAT Math: Polynomials
- PSAT Math: Rational Expressions and Equations
Test your PSAT readiness by taking this PSAT math quiz!
Answer 1
(9⁴ x 3²) / 9⁵ = (3²) / 9⁵⁻⁴ = 9/9 = 1
Answer 2
(–x + 4)(x – 5)
= –x(x – 5) + 4(x – 5)
= –x² + 5x + 4x – 20
= –x² + 9x – 20
Don’t let (B) fool you—the question asks for the coefficient of x, not x2, so the correct answer is (D).
Answer 3
Answer 4
B: Find the volume of each box and then subtract.
Box 1: V = x(x + 1)(x – 1) = x(x 2 – 1) = x 3 – x
Box 2: Substitute 2x for x in the volume you already found:
(2x)3 – 2x = 23x 3 – 2x = 8x 3 – 2x
Difference: (8x 3 – 2x) – (x 3 – x) = 8x 3 – x 3 – 2x + x = 7x 3 – x, (B).
Previous: PSAT Math Quiz: Rates, Ratios, Proportions, and Percents
Next: PSAT Math Quiz: Functions