Question

Find the value of f(-2) for the function f(x)5x^2 - 4
-26
16
-5
-2

Answer 1

• 16

Explanation:

Given function -

`\sf f(x) = 5x^2 - 4`

To Evaluate f(-2) put the value of x = -2 n the given function

`\sf f (-2) = 5(-2)² - 4`

`\sf f (-2) = 5(4) - 4`

`\sf f (-2) = 20 - 4`

`\sf f (-2) = 16`

Therefore, The value of f(-2) is 16

Answer 2

Answer: f(-2) = 16

Explanation:

To find the value of f(-2), we will substitute -2 for x into the given function. Then we will simplify using the Order of Operations (sometimes called PEMDAS).

Given:

f(x) = 5x² - 4

Substiute:

f(-2) = 5(-2)² - 4

Square:

f(-2) = 5(4) - 4

Multiply:

f(-2) = 20 - 4

Subtract

f(-2) = 16

f(-2) = 16