Question

If f(x) = 3x2 – 7, what is the value of f(-2)

Answer 1

Answer:

  f(-2) = 5

Step-by-step explanation:

Put the value where the variable is, and do the arithmetic.

  f(-2) = 3(-2)² -7 = 3(4) -7

  f(-2) = 5

Answer 2

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We have to find the value of f(-2) so we must place x = -2 in f(x) equation to get our required answer.

By Solving & simplifying we get,

$:\implies\sf{f(-2) = 3 {x}^{2} - 7}$

$:\implies\sf{f(-2) = 3 {( - 2)}^{2} - 7}$

$:\implies\sf{f(-2) = 3 \times 4 - 7}$

$:\implies\sf{f(-2) = 12 - 7}$

$:\implies\sf{f(-2) = 5}$

• The value of f(-2) is 5.