(x+5)²=9
x²+10x+25=9
x²+10x+16=0
(x+2)(x+8)=0
x+2=0 x+8=0
x=-2 x=-8
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(x+5)²=9
x²+10x+25=9
x²+10x+16=0
(x+2)(x+8)=0
x+2=0 x+8=0
x=-2 x=-8