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x+2 = p
p²-2p-8≥0
p=-2 dan p=4
x+2 = -2, maka x=-4
x+2 = 4, maka x=2
masukkan ke persamaan awal, sehingga didapat x≥2, dan x≤-4
nomor 2 :
kudratkan kiri dan kanan, sehingga didapat, x>5