Question

Evaluate the function. ƒ(x) = −3x² − x – 15 Find f(−8)

Answer 1

Given ~

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$\tt \: f(x) = −3x² − x – 15$

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now , put x= -8 in the function ~

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$\tt \: f( - 8) = −3( - 8)² − ( - 8) – 15$

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$\tt f(-8) = −3(64) − (-8) – 15$

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$\tt f(-8) = −192 − (-8) – 15$

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$\tt f(-8) = −192 − (-8) – 15$

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$\tt f(-8) = −184 – 15$

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$\underline{\boxed{\red {\tt f(-8) = - 199}}}{\green ✓}$

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hope helps ~