f(x)= 3x^2+2x. What is 2f(x-1)?
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Answer:
2(3x² - 4x - 5)
Step-by-step explanation:
f(x)= 3 + 2x
∴ 2f(x-1) = 2 * { + 2 * (x - 1)} = 2 * {3 * (x² - 2x - 1²) + 2x -2}
= 2 * {3x² - 6x - 3 + 2x - 2}
= 2 * (3x² - 4x - 5)
=> 2f(x-1) = 2(3x² - 4x - 5)
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