8,24,,48,72 What is the pattern
1 answer:
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Answer:
A
Step-by-step explanation:
Substitute x = f(x) into g(x), that is
g(f(x))
= g(3x² - 2x - 1)
= (3x² - 2x - 1)² = (3x² - 2x - 1)(3x² - 2x - 1)
Each term in the second factor is multiplied by each term in the first factor, that is
3x²(3x² - 2x - 1) - 2x(3x² - 2x - 1) - 1(3x² - 2x - 1) ← distribute parenthesis
= 9 - 6x³ - 3x² - 6x³ + 4x² + 2x - 3x² + 2x + 1 ← collect like terms
= 9 - 12x³ - 2x² + 4x + 1 → A
