Question

No. 4 gmn? ___________________

Answer 1

A. 4(x^2 - x) + 5 = 5(1 - x)
=> 4x^2 - 4x + 5 = 5 - 5x
=> 4x^2 + x = 0
=> x(4x + 1) = 0
=> x = 0 atau x = -1/4
HP = {-1/4, 0}

b. x^2 + ax - x = 2(a - 1)^2
=> x^2 + (a - 1)x - 2(a - 1)^2 = 0
misal a - 1 = p
=> x^2 + px - 2p^2 = 0
=> (x + 2p)(x - p) = 0
=> x = -2p atau x = -p
x = -2p = -2(a - 1) = -2a + 2 = 2 - 2a
x = -p = -(a - 1) = -a + 1 = 1 - a
HP = {2 - 2a, 1 - a}