Question

Order the steps to solve the equation log(x^2-15)=log(2x) form 1 to 5

Answer 1

Answer:x=-5 and x=3

Explanation:

log(x^2-15)=log(2x)

Cancel log at both sides we get

x^2-15=2x

Collect like terms

x^2-2x-15=0

x^2-3x+5x-15=0

x(x-3)+5(x-3)=0

(x+5)(x-3)=0

x+5=0 x-3=0

x=-5 x=3