Question

GI
Given the function f(x) = -2x2 + 4x - 7, find f(-4).
-55
-7
O 25

Answer 1

-55

Explanation:

Given that f(x) = -2x^2 + 4x - 7

We've to find f(-4),i.e.,the value of x in the function f(x) is -4

Putting the value of x and solving,we get:

• f(x) = -2x^2 + 4x - 7
• f(-4) = -2*(-4)² +(4* (-4)) -7
• f(-4) = -2*16 -16-7

Strictly follow PEMDAS rule:

• f(-4) = -32-33 = -55

Hence the value of function f(-4) is -55

Answer 2

-55

Explanation:

To find f ( -4 ) for the given function f ( x ) = - 2x² + 4x - 7, you simply need to substitute -4 for x and then calculate the value:

f ( -4 ) = -2 ( -4 )² + 4 ( -4 ) - 7

Now, let's calculate the value step by step:

f ( -4 ) = -2 ( 16 ) + 4 ( -4 ) - 7

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

Now, perform the addition and subtraction:

f ( -4 ) = -32 - 16 - 7 = -55