(x+3)(x+3)=16
x^2+3x+3x+9=16
x^2+6x+9-16=0
x^2+6x-7=0
a=1,b=6,c=-7
x=1 x=-7
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(x+3)(x+3)=16
x^2+3x+3x+9=16
x^2+6x+9-16=0
x^2+6x-7=0
a=1,b=6,c=-7
x=1 x=-7