Answer :
Final answer:
To find f(3), substitute 3 for x in the given function and simplify the expression. The value of f(3) is -8.
Explanation:
To find f(3), we replace x with 3 in the given function, f(x) = -5x² - x + 20.
So, f(3) = -5(3)² - 3 + 20 = -5(9) - 3 + 20 = -45 - 3 + 20 = -28 + 20 = -8.
Therefore, the value of f(3) is -8.
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