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x²+8x+16
1(x)²-2(x)(4)+1(4)²
x²-8x+16
(x²+8x+16)+(x²-8x+16)
x²+8x+16+x²-8x+16
x²+x²+8x-8x+16+16
2x²+32
b 1(2y)³+3(2y)²(3)+3(2y)(3)²+1(3)³
8y³+36y²+54y+27