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= 11x - 6 ≤ 16
= 11x ≤ 16 + 6
= 11x ≤ 22
= x ≤ 2
b.√x² + 4x - 12 < 9
= x² + 4x - 12 - 9 < 0
= x² + 4x - 21 < 0 (difaktorkan)
= (x + 7) (x - 3) < 0
x = -7 atau x = 3
c. √x² + 2x - 3 > √(x+2)²
= x² + 2x - 3 > x² + 4x + 4
= x² - x² + 2x - 4x - 3 - 4 > 0
= -2x - 7 > 0
= -2x > 7
= -x > 7/2
= x < -7/2
maaf kalau ada yang salah^^