Toán Lớp 9: Tìm x biết : 2x+2(x^2+2) +5x

2x + 2(x²+2)+5x-x²=0 ⇔2x+2x²+4+5x-x²=0 ⇔x²+7x+4=0 ⇔(x²+7x)+4=0 ⇔x²+7x=-4 ⇔x(x+7)=-4 ⇔x+7=-4x ⇔x+4x=-7 ⇔5x=-7 ⇔x=-7/5 Vậy x=-7/5

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Toán Lớp 9: Tìm x biết : 2x+2(x^2+2) +5x – x^2 = 0