d. x < -5 atau x > -1
Pembahasan :
I4x-1I > I3x-6I
I4x - 1I^2 > I3x - 6I^2
I6x^2 - 8x + 1I > 9x^2 - 36x + 36
6x^2 - 8x + 1 - 9x^2 + 36x - 36 > 0
7x^2 + 28x - 35 > 0
x^2 + 4x - 5 > 0
5 x -1 = 5
5 + -1 = -4
d. x < -5 atau x > -1
Pembahasan :
I4x-1I > I3x-6I
I4x - 1I^2 > I3x - 6I^2
I6x^2 - 8x + 1I > 9x^2 - 36x + 36
6x^2 - 8x + 1 - 9x^2 + 36x - 36 > 0
7x^2 + 28x - 35 > 0
x^2 + 4x - 5 > 0
5 x -1 = 5
5 + -1 = -4
Editor: Muhammad Khusaini