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Verified answer
P + q = -(2a + 1)/1p + q = -2a - 1
p + q = -2a - (q - p)
p + q = -2a + p - q
2q = -2a
q = -a
q - p = 1
p = 1 + q
p = 1 - a
p.q = 20/1
pq = 20
(1 - a)(-a) = 20
-a + a² = 20
a² - a - 20 = 0
(a - 5)(a + 4) = 20
a = 5
atau
a = -4
Karena q < 0, maka a yang berlaku adalah 5, sebab
q = -a
q = -5
Jadi,
2a = 2(5) = 10