Question

solve 5x^2 -45

Answer 1

where is the equal sign?

Answer 2

5x^2 \[=\]45

Answer 3

\[=5(x^2 - 9) = 5(x-3)(x+3)\]

Answer 4

So just set it to be 0

Answer 5

divide both sides by 5
x^2=9
sqrt x^2 = sqrt 9
x=3

Answer 6

x = ±3

Answer 7

^correct + or - 3, my bad :)

Answer 8

thanks! :)