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10-3x<11-4x
4x+3x<10+11
x=3
7. |x+3|² < 12 |x-17|
x²+6x+9 < 12.|x-17|
maka :
x²+6x+9 < 12x - 204 atau -x²-6x-9 > 12x - 204
x²-6x+213 < 0 atau 0 > x²+18x-195
x²-6x+213 < 0 ; imajiner
x²+18x-195 < 0
(x+(9+2√69))(x-(9-2√69)) < 0
maka: -9-2√69 < x < 2√69 - 9
HP = { x | -9-2√69 < x < 2√69 - 9 ; x ∈ R}