Question

7. f(x) = 2x + 5 What is the value of x if f(x) = 25 ?

Answer 1

x = 10

Explanation:

f(x) equals both 25 and 2x + 5, so set the equations equal to one another and solve for x.

2x + 5 = 25

2x = 20

x = 10

Plug in what you got for x to check if it is right

2(10) + 5 = 25

20 + 5 = 25

25 = 25

Answer 2

x=10

Explanation:

set the 2 equations equal to each other

25=2x+5 -> subtract 5

20=2x -> divide by 2

10=x ->answer!

Hope that helps!