Question 603856
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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