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4 sedemikian x-3 sedemikian lebih dari x
artinya tau cara gk tau maaf ya
|x+2|² ≥( 2x+1)²
x²+4+4x≥4x²+1+4x
0≥4x²-x²+4x-4x+1-4
0≥3x²-3
0≥(3x+3)(x-1)
batas ⇒x=1 dan x=-1/3
maka hp={x|-1/3≤x≤1}