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8 kuadrat = 8 . 8
= 64
x - y = 4
2y = 8
y = 4 ⇒ x = 12 - 4 = 8
8² - 4² = 64 - 16 = 48
atau
(x + y)(x - y) = x² - y²
12 x 4 = x² - y² = 48