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0 ≤ x^2 -4x - 5
0 ≤ (x - 5)(x+1)
x ≥ 5 atau x ≤ -1
x² - 4x - 5 ≥ 0
faktorkan:
(x-5) (x+1) ≥ 0
x - 5 ≥ 0 x+1 ≥ 0
x ≥ 5 x ≥ -1
x = 4 x = -2
16 - 16 - 5 ≥ 0 4 + 8 + 10 ≥ 0
salah benar
maka hp = {x| -1≥x≥5,eR}