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=> x- y = 6 - 4 = 2. Kuadratkan, maka hasilnya 4.
b.) Kuadrat selisih, berarti buat persamaan.
=> (x - y)² = x² - 2xy + y². Substitusi x= 6 dan y = 4,
=> x² - 2xy + y²
=> (6)² - 2(6)(4) + (4)² = 36 - 48 + 16 = 52 - 48 = 4