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GradienTitik A = (a , -11), x1 = a y1 = -11
Titik B = (3, -11) x2 = 3 y2 = -11
Jarak kedua titik = √(x1 - x2)² + (y1 - y2)²
17 = √(a - 3)² + (-11 + 11)²
17² = (a - 3) (a - 3) + 0
17² = a² - 3a - 3a + 9 + 0
17² = a² - 6a + 9
a² - 6a + 9 - 289 = 0
a² - 6a - 280 = 0
(a + 14) (a - 20) = 0
a = -14 atau a = 20 |ambil nilai positif|
Jadi, nilai a adalah = 20
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