How do you convert x(2) squared + 18x =-45? Thanks!!

2 Answers
May 11, 2018

(x+3 ) (x +15 )

Explanation:

Add -45 to the LH side

x^2 + 18x +45

(x+3 ) (x +15 )

The reason I chose 15 because 15 * 3 = 45 and you need to get the middle part to be 18 so the two numbers that equal 45 must add up to 18

May 11, 2018

x = -15 and x = -3

Explanation:

x^2 + 18x = -45

Move all to one side:
x^2 + 18x + 45 = 0

Factor by looking for 2 Numbers to Multiply to 45 and Add to 18:
(x + 15)(x+3) = 0

Set each Factor =0 and solve for x:
x + 15 = 0
x = -15

x + 3 = 0
x = -3