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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: 2x^2+3x-6 phân tích thành nhân tử’

Toán Lớp 8: 2x^2+3x-6
phân tích thành nhân tử’

Comments ( 1 )

  1. Giải đáp:
    $2\left(x+\dfrac{3-\sqrt{57}}{4}\right)\left(x+\dfrac{3+\sqrt{57}}{4}\right).$
    Lời giải và giải thích chi tiết:
    $2x^2+3x-6\\ =2\left(x^2+\dfrac{3}{2}x-3\right)\\ =2\left(x^2+2.\dfrac{3}{4}x-3\right)\\ =2\left(x^2+2.\dfrac{3}{4}x+\dfrac{9}{16}-\dfrac{57}{16}\right)\\ =2\left(\left(x+\dfrac{3}{4}\right)^2-\left(\dfrac{\sqrt{57}}{4}\right)^2\right)\\ =2\left(x+\dfrac{3}{4}-\dfrac{\sqrt{57}}{4}\right)\left(x+\dfrac{3}{4}+\dfrac{\sqrt{57}}{4}\right)\\ =2\left(x+\dfrac{3-\sqrt{57}}{4}\right)\left(x+\dfrac{3+\sqrt{57}}{4}\right).$

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222-9+11+12:2*14+14 = ? ( )