Question

Solve by completing the square:
x(squared) + 2x -15
And
6 + 4x - x(squared)

Answer 1

Steps for completing the square here;

http://www.regentsprep.org/regents/math/algtrig/ate12/completesqlesson.htm

Answer 2

x^2 + 2x + ___ = 15 + _____

x^2 + 2x + __ 1 __ = 15 + __1__

(x + 1) ^2 = 16

Take square roots

(x + 1 ) = 4 or x + 1 = -4

x = 3 or x = -5

Answer 3

You do this one:

6 + 4x - x^2

Answer 4

@Sarkiny

Answer 5

Thank you!
x^2 - 4x - 6
(x - 2)^2 - 4 - 6
(x - 2)^2 - 10
I think this is the solution only on one side because in this question they don't ask us to make a second side.
So the first that you did is gonna be
(x + 1)^2 -16 right?

Answer 6

yes,it should be (x+1)^2-16 if the solution is only one side @Sarkiny