is it the perfect square if yes then factorise it
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x²+16x+64
x²+(8+8)x+64
x²+8x+8x+64
x(x+8)+8(x+8)
(x+8)(x+8)
Then x=-8
x²+(8+8)x+64
x²+8x+8x+64
x(x+8)+8(x+8)
(x+8)(x+8)
Then x=-8
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