You can put this solution on YOUR website! The square of a negative number is fifteen more than twice the negative number.
Find the number
:
Let x = "the number"
:
(x)^2 = 2(x) + 15
x^2 = 2x + 15
x^2 - 2x - 15 = 0
Factor
(x-5)(x+3) = 0
x = 5
and
x = -3, the negative solution is what they want
;
:
Check solution
(-3)^2 = 2(-3) + 15
9 - 6 = 15
