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

Question

Mathematics

Boo Boo

19 January, 16:15

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

+5

Answers (1)

Know the Answer?

Eliezer Weiss · Answer 1

Answer:x=-5 and x=3

Step-by-step 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