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

Toán Lớp 8: Phân tích đa thức thành nhân tử x² – x – 3

Toán Lớp 8: Phân tích đa thức thành nhân tử
x² – x – 3

Comments ( 1 )

  1. x^2 – x – 3
    = (x^2 – x + 1/4) – 1/4 – 3
    = (x – 1/2)^2 – 13/4
    = (x – 1/2)^2 – $\sqrt{\dfrac{13}{4}}$
    = (x – 1/2)^2 – $\dfrac{\sqrt{13}}{2}$
    = (x – 1/2 – $\dfrac{\sqrt{13}}{2}$)(x – 1/2 +$\dfrac{\sqrt{13}}{2}$)
    = (x – $\dfrac{1 + \sqrt{13}}{2}$)( x + $\dfrac{\sqrt{13} – 1}{2}$)
     

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

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