[Toán 8]Phân tích thành nhân tử

N

nguyenkhoi1999

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T

thaolovely1412

Phan tich thanh nhan tu.
a) [TEX] x^4[/TEX]−[TEX]9x^3[/TEX]+[TEX]28x^2[/TEX]−36x+16
[TEX]=x^4-5x^3+4x^2-4x^3+20x^2-16x+4x^2-20x+16[/TEX]
[TEX]=(x^4-5x^3+4x^2)-(4x^3-20x^2+16x)+(4x^2-20x+16)[/TEX]
[TEX]=x^2(x^2-5x+4)-4x(x^2-5x+4)+4(x^2-5x+4)[/TEX]
[TEX]=(x^2-4x+4)(x^2-5x+4)[/TEX]
 
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