Hi,



x^2+4x-77=0

factoring

(x + 11)(x-7) = 0   |using the principle of zero products

( x + 11)= 0   x = -11

 (x-7) = 0     x = 7



May check your factoring using the FOIL Method

(x + 11)(x-7) = 0 

F	First terms  x^2 

O	Outside terms -7x

I	Inside terms  11x

L	Last terms    -77

    

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