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(- x + 8)²
(- x + 8)(- x + 8)
- x(- x) - x(8) + 8(- x) + 8(8)
x² - 8x - 8x + 64
x² - 16x + 64
Yang B
(2r - 2y)²
(2r - 2y)(2r - 2y)
2r(2r) + 2r(- 2y) - 2y(2r) - 2y(- 2y)
4r² - 4ry - 4ry + 4y²
4r² - 8ry + 4y²