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y² - y ≥ 6
y² - y - 6 ≥ 0
(y + 2)(y - 3) ≥ 0
pembuat nol fungsi
y + 2 = 0 ===> y = -2 atau
y - 3 = 0 ===> y = 3
dengan garis bilangan didapat y ≤ -2 atau y ≥ 3
I2x + 3I ≥ -3
mentok .. heheh.. lupa..:)