1) (8x-y)²-64x²= 64x² - 16xy + y² - 64x² = y²-16xy
2) 2·(a-b)²= 2·(a²-2ab+b²) = 2a²- 4ab + 2b²
3) -y·(3x-y)²= - y·(9x²-6xy+y²) = - 9x²y + 6xy² - y³
4) a·(4-a)+(4-a)² = 4a - a² + 16 - 8a +a² = 16 - 4a
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Answers & Comments
1) (8x-y)²-64x²= 64x² - 16xy + y² - 64x² = y²-16xy
2) 2·(a-b)²= 2·(a²-2ab+b²) = 2a²- 4ab + 2b²
3) -y·(3x-y)²= - y·(9x²-6xy+y²) = - 9x²y + 6xy² - y³
4) a·(4-a)+(4-a)² = 4a - a² + 16 - 8a +a² = 16 - 4a