Question

Does anyone know the answer?

Answer 1

a. -13

b. 14

c. -6

Explanation:

a.

Substitute x = -3 into the equation.

f(-3) = 2(-3) - 7

= - 6 - 7

= -13

b.

Substitute f(x) = 21 into the equation.

2x - 7 = 21

2x = 28

x = 14

c.

Substitute x = 1/2 into the equation.

f(1/2) = 2(1/2) - 7

= 1 - 7

= -6