Question

given the function f(x) = −2x2 4x − 7, find f(−4). −55 −7 9 25

Answer 1

$f(x)=-2x^2+4x-7\\\\x=-4,\ subtitute\\\\f(-4)=-2\cdot(-4)^2+4\cdot(-4)-7=-2\cdot16-16-7\\\\=-32-16-7=-55\\\\\boxed{f(-4)=-55}$

Answer 2

The function of the given parabolic equation is -55.

What is the function of f(x)?

The function of f(x) relates to y for which the input of values of x gives a desired output of y.

Given that:

• f(x) = -2x²+ 4x - 7

To find f(-4), we replace the value of x in the above equation with -4.

• f(-4) = -2(-4)² + 4 (-4) - 7

y = f(-4) = -32 - 16 - 7

y = f(-4) = -55

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