(2x+1)^3-8×(x+2)×(x^2-2x+4)

2 câu trả lời

(2x+1)3−8(x+2)(x2−2x+4)

=8x3+3.4x2+3.2x+1−8(x3−2x2+4x+2x2−4x+8)

=8x3+12x2+6x+1−8x3+16x2−32x−16x2+32x−64)

=12x2+6x−63

(2x+1)38(x+2)(x22x+4)

=8x3+3.4x2+3.2x+18(x32x2+4x+2x24x+8)

=8x3+12x2+6x+18x3+16x232x16x2+32x64)

=12x2+6x63

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