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Hi,
-x^2=2x-15
same as:(Adding x^2 to both sidess of the EQ)
x^2 +4x+4 = 0
factoring
(x+2)(x+2) = 0
(x+2) =0, x= -2
May check factoring using the FOIL method
F First terms x^2
O Outside terms 2x
I Inside terms 2x
L Last terms 4
