Question

F(x)=−x 2 −9x \text{Find }f(-2) Find f(−2)

Answer 1

f(- 2) = 14

Explanation:

substitute x = - 2 into f(x)

f(- 2) = - (- 2)² - 9(- 2) = - (4) + 18 = - 4 + 18 = 14

Answer 2

f(-2) = 14

Explanation:

f(x) = -x^2 -9x

Let x = -2

f(-2) =- (-2) ^2 -9(-2)

Exponents first

f(-2) =- 4 -9(-2)

Multiply

f(-2) =- 4+18

Add

f(-2) =14