Toán Lớp 8: a) 3x(x + 1)^2 – 5x^2 (x + 1) + 7 (x + 1) ai giúp em với :((
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Toán Lớp 8: a) 3x(x + 1)^2 – 5x^2 (x + 1) + 7 (x + 1) ai giúp em với :((
Comments ( 2 )
= 3x[(x)^2+2(x)(1)+(1)^2]-5x^3-5x^2+7x+7
=3x(x^2+2x+1)-5x^3-5x^2+7x+7
=3x^3+6x^2+3x-5x^3-5x^2+7x+7
=3x^3-5x^3+6x^2-5x^2+3x+7x+7
=-2x^3+x^2+10x+7
3x(x + 1)^2 – 5x^2 (x + 1) + 7 (x + 1)
=(x+1)[3x(x+1)-5x^2+7]
=(x+1)(3x^2+3x-5x^2+7)
=(x+1)(3x-2x^2+7)