Please help me solve x squared + 8x+16

I really don't understand
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2 Answers

x^2 +8x+16=0

become (x+4)*(x+4)=0

or x=-4 (twies)
by
x squared+4x+4x+16

x(x+4)+4(x+4)

(x+4)(x+4)
by

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