6x² - 12xy + 6y² - x + y - 8 = (6x² - 12xy + 6y²) - (x - y) - 8 =
= 6(x² - 2xy + y²) - (x - y) - 8 = 6*(x - y)² - (x - y) - 8
↑ ↑
10 10
6 * 10² - 10 - 8 = 6 * 100 - 18 = 582
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Verified answer
6x² - 12xy + 6y² - x + y - 8 = (6x² - 12xy + 6y²) - (x - y) - 8 =
= 6(x² - 2xy + y²) - (x - y) - 8 = 6*(x - y)² - (x - y) - 8
↑ ↑
10 10
6 * 10² - 10 - 8 = 6 * 100 - 18 = 582