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p = 2q
sehingga
2q + q = a + 1
3q = a + 1
q = a + 1 / 3
2q.q = 2a - 1
2q² = 2a - 1
substitusi
2.(a + 1 / 3)² = 2a - 1
2(a² + 2a + 1 / 9) = 2a - 1
2a² + 4a + 2 / 9 = 2a - 1
kali 9
2a² + 4a + 2 = 18a - 9
2a² - 14a + 11 = 0
2a² - 14a = -11
a² - 7a = -5,5
maka nilai dari a² - 7a + 10
= -5,5 + 10 = 4,5