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kedua ruas kita kuadratkan, maka
x²+10x+25 ≥ x²-4x+4
14x + 21 ≥ 0
14x ≥ -21
x ≥ -21/14
x ≥ -3/7
Hp = {-3/7}
2). | 2x+1 | < | x+1 |
kedua ruas kita kuadratkan, maka
4x²+4x+1 < x²+2x+1
2x²+2x < 0
2x(x+1) < 0
x+1 < 0
x = -1
x = 0
Hp = { 0 , -1}