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

Toán Lớp 8: Bài 1: Phân tích đa thức thành nhân tử `a) f(x)=x^4+324` `b) f(x)=x^8=1024` `c) f(x)=x^8+3x^4+4`

Toán Lớp 8: Bài 1: Phân tích đa thức thành nhân tử
a) f(x)=x^4+324
b) f(x)=x^8=1024
c) f(x)=x^8+3x^4+4

Comments ( 2 )

  1. a)f(x)=x^4+324 
    =x^4+2.18.x^2+18^2-36x^2
    =(x^2+18)^2-(6x)^2
    =(x^2-6x+18)(x^2+6x+18)
    b)f(x)=x^8+1024
    =x^8+2.x^{4}.32+32^2-64x^4
    =(x^4+32)^2-(8x)^2
    =(x^4-8x^2+32)(x^4+8x^2+32)
     c)f(x)=x^8+3x^4+4
    =x^8+4x^4+4-x^4
    =(x^4+2)^2-(x^2)^2
    =(x^4+x^2+2)(x^4-x^2+2)

  2. ~rai~
    \(a)x^4+324\\=x^4+324+36x^2-36x^2\\=(x^4+36x^2+324)-36x^2\\=(x^2+18)^2-36x^2\\=(x^2+18)^2-(6x)^2\\=(x^2+6x+18)(x^2-6x+18).\\b)x^8+1024\\=(x^8+64x^4+1024)-64x^4\\=(x^4+32)^2-64x^4\\=(x^4+32)^2-(8x^2)^2\\=(x^4+8x^2+32)(x^4-8x^2+32).\\c)x^8+3x^4+4\\=(x^8+4x^4+4)-x^4\\=(x^4+2)-x^4\\=(x^4+2)^2-(x^2)^2\\=(x^4+x^2+2)(x^4-x^2+2).\)
     

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