phân tích đa thức thành nhân tử
x2-y2+a2-b2+2ax+2by
x3-2x2-6x+27
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Lời giải:
$x^2-y^2+a^2-b^2+2ax+2by=(x^2+a^2+2ax)-(y^2+b^2-2by)$
$=(x+a)^2-(y-b)^2=(x+a-y+b)(x+a+y-b)$
\(x^2y^2+2x^2+y^2+2\)
\(=x^2\left(y^2+2\right)+\left(y^2+2\right)\)
\(=\left(x^2+1\right)\left(y^2+2\right)\)
\(a^2-b^2+a-b\)
\(=\left(a+b\right)\left(a-b\right)+\left(a-b\right)\)
\(=\left(a+b+1\right)\left(a-b\right)\)
\(a,x^2y^2+2x^2+y^2+2\)
\(=y^2\left(x^2+1\right)+2\left(x^2+1\right)\)
\(=\left(y^2+2\right)\left(x^2+1\right)\)
\(b,a^2-b^2+a-b\)
\(=\left(a+b\right)\left(a-b\right)+\left(a-b\right)\)
\(=\left(a-b\right)\left(a+b+1\right)\)
\(x^2-6x+7=x^2-6x+9-2\\ =\left(x-3\right)^2-2=\left(x-3-\sqrt{2}\right)\left(x-3+\sqrt{2}\right)\\ x^4+64=x^4+16x^2+64-16x^2\\ =\left(x^2+8\right)^2-16x^2=\left(x^2-4x+8\right)\left(x^2+4x+8\right)\\ a^4+4b^4=a^4+4a^2b^2+4b^4-4a^2b^2\\ =\left(a^2+2b^2\right)^2-4a^2b^2\\ =\left(a^2-2ab+2b^2\right)\left(a^2+2ab+2b^2\right)\)
= x2 -7x -x +7
= x. (x-7) - (x-7)
= (x-1)(x-7)
Chúc bạn học tốt nha!
\(x^2-2xy+y^2+3x-3y-4\)
\(=\left(x-y\right)^2-1+3x-3y-3\)
\(=\left[\left(x-y\right)^2-1^2\right]+\left(3x-3y-3\right)\)
\(=\left[\left(x-y\right)-1\right]\left[\left(x-y\right)+1\right]+3\left(x-y-1\right)\)
\(=\left(x-y-1\right)\left(x-y+1\right)+3\left(x-y-1\right)\)
\(=\left(x-y-1\right)\left[\left(x-y+1\right)+3\right]\)
\(=\left(x-y-1\right)\left(x-y+4\right)\)
b) \(\left(a^2+b^2\right)^2-4a^2b^2\)
\(=\left(a^2-2ab+b^2\right)\left(a^2+2ab+b^2\right)\)
\(=\left(a-b\right)^2\cdot\left(a+b\right)^2\)
c) \(a^4-b^4=\left(a-b\right)\left(a+b\right)\left(a^2+b^2\right)\)
b: \(=2x^2-2x-5x+5\)
\(=\left(x-1\right)\left(2x-5\right)\)
\(a,=x\left(x^2-4\right)+ax\left(x-2\right)\\ =x\left(x-2\right)\left(x+2\right)+ax\left(x-2\right)\\ =\left(x-2\right)\left(x^2+2x+ax\right)\\ =x\left(x+a+2\right)\left(x-2\right)\\ b,=2x^2-2x-5x+5\\ =2x\left(x-1\right)-5\left(x-1\right)\\ =\left(2x-5\right)\left(x-1\right)\\ c,=\left(x+3\right)\left(x^2-3x+9\right)+\left(x-3\right)\left(x+3\right)\\ =\left(x+3\right)\left(x^2-2x+6\right)\)
\(x^2-4x-y^2+4=\left(x^2-4x+4\right)-y^2=\left(x-2\right)^2-y^2=\left(x-2-y\right)\left(x-2+y\right)\)
x2 - y2 + a2 - b2 + 2ax + 2by
= ( x2 + 2ax + a2 ) - ( b2 - 2by + y2 )
= ( x + a )2 - ( b - y )2
= ( x + a - b + y ) ( x + a + b - y )
x3 - 2x2 - 6x + 27
= ( x - 3 )3
x3 35 2 = 688