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5 votes
Complete the square to solve the equation below. x^2+2x-9=15

2 Answers

4 votes

Answer: x=-6; x=4

Explanation:

User Cetin Basoz
by
6.9k points
6 votes

Answer:

Explanation:

x^2+2x-9=15

x^2+2x=24

x^2+2x+1=24+1

(because what you do to one side you do to the other) ^

(x+1)^2=25

(x+1)^2 -25=0

(25 is a perfect square)

(x+1-5)(x+1+5)

(x-4)(x+6)

x=4,-6

User Elar
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7.6k points