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(x + 2)(x - 2) - (x - 2)(x + 5)
= (x - 2)(x + 2 - x - 5)
= (x - 2)-3
= -3x + 6
b) 2x(3x2y + 4x2y - 3)
= 2x(7x2y - 3)
= 14x3y - 6x
a: \(=25x^4-10x^3+5x^2\)
c: \(=2x^3-3x-5x^3-x^2+x^2=-3x^3-3x\)
1, ( x + 3 )( x- 4 ) + ( x - 4 ) mũ 2
=x^2+4x+3x-12+x^2-8x+16
=2x^2-x+4
3, x( x -14 ) - 10(x - 1) mũ 2
=x^2-14x-10(x^2-2x+1)
=x^2-14x-10x^2-20x+10
=-9x^2-34x+10
\(a,\left(x-3\right)\left(x^2+3x+9\right)-\left(x^2-1\right)\left(x+27\right)\)
\(=\left(x^3-27\right)-x^3-27x^2+x+27=x-27x^2\)
\(b,\left(3-x\right)^3-\left(x+3\right)\left(x^2-3x+9\right)\)
\(=27-9x+3x^2-x^3-\left(x^3+27\right)=3x^2-9x-2x^3\)
\(c,\left(x-2\right)\left(x^2+2x+4\right)-x\left(x-3\right)\left(x+3\right)\)
\(=\left(x^3-8\right)-x\left(x^2-9\right)=x^3-8-x^3+9x=9x-8\)
a) (x-3)(x2+3x+9)-(x2-1)(x+27)
=(x3-27)-(x3+27x2-x-27)
=x3-27-x3-27x2+x+27
=-27x2+x
=x(-27x+1)
b) (3-x)3-(x+3)(x2-3x+9)
=27-27x+9x2-x3-x3-27
=-2x3+9x2-27x
=x(-2x+9x-27)
c) (x-2)(x2+2x+4)-x(x-3)(x+3)
=x3-8-x(x2-9)
=x3-8-x3+9x
=9x-8
#H
\(\left(-x\right)\left(x^2-x+1\right)+\dfrac{1}{2}x^2\left(2x-4\right)+x\cdot x+x\cdot1-2\)
\(=-x^3+x^2-x+x^3-2x^2+x^2+x-2\)
\(=\left(-x+x^3\right)+\left(x^2-2x^2+x^2\right)+\left(-x+x\right)+\left(-2\right)\)
\(=-2\)
Thanks nha