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x²+8x-9 < 0
(x+9)(x-1) = 0
x+9 = 0 atau x-1 = 0
x = -9 atau x = 1
HP = {-9 < x < 1}
b.
x²-x-20 > 0
(x-5)(x+4) > 0
x-5 = 0 atau x+4 = 0
x = 5 atau x = -4
HP = {x < -4 atau x > 5}
c.
2x²+5x+3 ≥ 0
mungkin maksud soalnya
2x²+5x-3 ≥ 0
(2x-1)(x+3) ≥ 0
2x-1 = 0 atau x+3 = 0
x=1/2 atau x= -3
HP = {x ≤ -3 atau x ≥ 1/2}
d.
2x²+7x+3 ≤ 0
(2x+1)(x+3) ≤ 0
2x+1 = 0 atau x+3 = 0
x = -1/2 atau x = -3
HP = {-3 ≤ x ≤ -1/2}
e.
x²-16 ≤ 0
(x-4)(x+4) ≤ 0
x-4 = 0 atau x+4 = 0
x = 4 atau x = -4
HP = {-4 ≤ x ≤ 4}