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26) Ta có: \(x^4-20x^2+64\)
\(=x^4-16x^2-4x^2+64\)
\(=x^2\left(x^2-16\right)-4\left(x^2-16\right)\)
\(=\left(x-4\right)\left(x+4\right)\left(x-2\right)\left(x+2\right)\)
27) Ta có: \(4x^3+6x^2+3x+1\)
\(=4x^3+4x^2+2x^2+2x+x+1\)
\(=4x^2\left(x+1\right)+2x\left(x+1\right)+\left(x+1\right)\)
\(=\left(x+1\right)\left(4x^2+2x+1\right)\)
28) Ta có: \(x^3-6x^2+12x-9\)
\(=x^3-3x^2-3x^2+9x+3x-9\)
\(=x^2\cdot\left(x-3\right)-3x\left(x-3\right)+3\left(x-3\right)\)
\(=\left(x-3\right)\left(x^2-3x+3\right)\)
29: Ta có: \(x^4+x^2+1\)
\(=x^4+2x^2+1-x^2\)
\(=\left(x^2+1\right)^2-x^2\)
\(=\left(x^2-x+1\right)\left(x^2+x+1\right)\)
26) Ta có: x4−20x2+64x4−20x2+64
=x4−16x2−4x2+64=x4−16x2−4x2+64
=x2(x2−16)−4(x2−16)=x2(x2−16)−4(x2−16)
=(x−4)(x+4)(x−2)(x+2)=(x−4)(x+4)(x−2)(x+2)
27) Ta có: 4x3+6x2+3x+14x3+6x2+3x+1
=4x3+4x2+2x2+2x+x+1=4x3+4x2+2x2+2x+x+1
=4x2(x+1)+2x(x+1)+(x+1)=4x2(x+1)+2x(x+1)+(x+1)
=(x+1)(4x2+2x+1)=(x+1)(4x2+2x+1)
28) Ta có: x3−6x2+12x−9x3−6x2+12x−9
=x3−3x2−3x2+9x+3x−9=x3−3x2−3x2+9x+3x−9
=x2⋅(x−3)−3x(x−3)+3(x−3)=x2⋅(x−3)−3x(x−3)+3(x−3)
=(x−3)(x2−3x+3)=(x−3)(x2−3x+3)
29: Ta có: x4+x2+1x4+x2+1
=x4+2x2+1−x2=x4+2x2+1−x2
=(x2+1)2−x2=(x2+1)2−x2
=(x2−x+1)(x2+x+1)
\(x^2+2xy+7x+7y+y^{2+10}\)
\(\text{phân tích đa thức thành nhân tử}\)
\(y^{12}+2xy+7y+x^2+7x\)
tách \(^{x^2}\)ra rồi làm thừa số chung, toán SGK đem ra hỏi làm j
(x^2+1)^2 - 4x(1-x^2)
=(x^2-1)^2 + 4x^2 + 4x(x^2-1)
(=(x^2-1+2x)^2
=((x-1)^2)^2
=(x-1)^4
19) Ta có: \(-x^2-4x-4\)
\(=-\left(x^2+4x+4\right)\)
\(=-\left(x+2\right)^2\)
20) Ta có: \(-4x^2-12x-9\)
\(=-\left(4x^2+12x+9\right)\)
\(=-\left(2x+3\right)^2\)
21) Ta có: \(-4x^2-4x-1\)
\(=-\left(4x^2+4x+1\right)\)
\(=-\left(2x+1\right)^2\)
22) Ta có: \(-x^2+6x-9\)
\(=-\left(x^2-6x+9\right)\)
\(=-\left(x-3\right)^2\)
23) Ta có: \(-x^2+10x-25\)
\(=-\left(x^2-10x+25\right)\)
\(=-\left(x-5\right)^2\)
24) Ta có: \(-x^2+8x-16\)
\(=-\left(x^2-8x+16\right)\)
\(=-\left(x-4\right)^2\)
25) Ta có: \(-4x^2+12x-9\)
\(=-\left(4x^2-12x+9\right)\)
\(=-\left(2x-3\right)^2\)
26) Ta có: \(a^2-a+b-b^2\)
\(=\left(a-b\right)\left(a+b\right)-\left(a-b\right)\)
\(=\left(a-b\right)\left(a+b-1\right)\)
13) Ta có: \(y^2-2xy+2x-y\)
\(=y\left(y-2x\right)-\left(y-2x\right)\)
\(=\left(y-2x\right)\left(y-1\right)\)
14) Ta có: \(x-2xy+4y-2\)
\(=x\left(1-2y\right)-2\left(1-2y\right)\)
\(=\left(1-2y\right)\left(x-2\right)\)
15) Ta có: \(x^2-2xy+x-2y\)
\(=x\left(x-2y\right)+\left(x-2y\right)\)
\(=\left(x-2y\right)\left(x+1\right)\)
16) Ta có: \(xy-z-y+xz\)
\(=x\left(y+z\right)-\left(y+z\right)\)
\(=\left(y+z\right)\left(x-1\right)\)
17) Ta có: \(2xy+3z-6y-xz\)
\(=\left(2xy-xz\right)+\left(3z-6y\right)\)
\(=x\left(2y-z\right)-3\left(2y-z\right)\)
\(=\left(2y-z\right)\left(x-3\right)\)
18) Ta có: \(2xy-2z+4y-xz\)
\(=\left(2xy+4y\right)+\left(xz+2z\right)\)
\(=2y\left(x+2\right)+z\left(x+2\right)\)
\(=\left(x+2\right)\left(2y+z\right)\)