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

 

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