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2. x2 - 7x -7x + 49 = x2 -14x + 49
3. x2 -6x + 6x - 36 = x2 -36
x2 itu x kuadrat yaaa
= x (x-3) - 7 (x-3)
= x² - 3x - 7x + 21
= x² - 10x + 21
2. (x-7) (x-7)
= x² - 7x - 7x + 49
= x² - 14x + 49
3. (x+6) (x-6)
= x² - 6x + 6x - 36
= x² - 36