Hi,

-x^2=2x-15

same as:(Adding x^2 to both sidess of the EQ)

x^2 +2x-15 = 0

factoring

(x+5)(x-3) = 0

(x+5) =0,  x= -5

(x-3) = 0, x = 3



May check factoring using the FOIL method

F	First terms    x^2

O	Outside terms  -3x

I	Inside terms   5x

L	Last terms    -15

 

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