Find f(-2), if f(x) = 2x^2 - 8x + 3.

f(-2)=27

Step-by-step explanation:

Plug in -2 into x

f(-2)=2(-2)^2-8(-2)+3

f(-2)=8+16+3

f(-2)=27

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: