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(sisi miring)² = (sisi alas)² + (sisi tegak)²
(=) (x + 8)² = (x)² + (x + 7)²
(=) x² + 16x + 64 = x² + x² + 14x + 49
(=) x² + 16x + 64 = 2x² + 14x + 49
(=) x² - 2x² + 16x - 14x + 64 - 49 = 0
(=) -x² + 2x + 15
(=) x² - 2x - 15
faktorkan
(x - 5)(x + 3)
x - 5 = 0
x = 5
x + 3 = 0
x = -3
karena panjang tidak bernilai negatif, maka ambil yang x = 5
panjang QR = x + 7
= 5 + 7
= 12 cm