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\(x^{14}+16\)
\(=x^{14}+4^2\)
\(=x^{14}+8x^7+4^2-8x^7\)
\(=\left(x^7+4\right)^2-\sqrt{8x^7}^2\)
\(=\left(x^7+4-\sqrt{8x^7}\right)\left(x^7+4+\sqrt{8x^7}\right)\)
\(x^{16}+4\)
\(=x^{16}-2x^{12}+2x^{12}+2x^8+2x^8-4x^8+4x^4-4x^4+4\)
\(=\left(x^{16}-2x^{12}+2x^8\right)+\left(2x^{12}-4x^8+4x^4\right)\)
\(+\left(2x^8-4x^4+4\right)\)
\(=x^8\left(x^8-2x^4+2\right)+2x^4\left(x^8-2x^4+2\right)\)
\(+2\left(x^8-2x^4+2\right)\)
\(=\left(x^8+2x^4+2\right)\left(x^8-2x^4+2\right)\)
ミ★长 - ƔξŦ★彡: Làm dài vại:(
\(x^{16}+4\)
\(=\left(x^{16}+4x^8+4\right)-4x^8\)
\(=\left(x^8+2\right)^2-\left(2x^4\right)^2\)
\(=\left(x^8+2-2x^4\right)\left(x^8+2+2x^4\right)\)
\(x^4-4x^3+8x^2-16x+16 \)
\(=x^3\left(x-2\right)-2x^2\left(x-2\right)+4x\left(x-2\right)-8\left(x-2\right)\)
\(=\left(x-2\right)\left(x^3-2x^2+4x-8\right)\)
\(=\left(x-2\right)\left[x^2\left(x-2\right)+4\left(x-2\right)\right]\)
\(=\left(x-2\right)^2\left(x^2+4\right)\)
\(x^3+9x^2+6x-16\)
\(=x^3+x^2-2x+8x^2+8x-16\)
\(=x\left(x^2+x-2\right)+8\left(x^2+x-2\right)\)
\(=\left(x^2+x-2\right)\left(x+8\right)\)
\(=\left(x^2-x+2x-2\right)\left(x+8\right)\)
\(=\left[x\left(x-1\right)+2\left(x-1\right)\right]\left(x+8\right)\)
\(=\left(x-1\right)\left(x+2\right)\left(x+8\right)\)
x3 - x2 + 16x - 16 = x2(x - 1) + 16(x - 1) = (x2 + 16)(x - 1)
x^3-x^2+16x-16 = (x^3-x^2)+(16x-16) = x^2.(x-1) + 16.(x-1) = (x-1)(x^2+16)
Ta có
(x2-3)2+16
=x4-6x2+9+16
=x4-6x2+25
=x4+10x2+25-16x2
=(x2+5)2-16x2
=(x2+5-4x)(x2+5+4x)
\(x^3-9x^2+6x+16=\left(x^3+x^2\right)-\left(10x^2+10x\right)+\left(16x+16\right)\)
\(=x^2.\left(x+1\right)-10x\left(x+1\right)+16\left(x+1\right)\)
\(=\left(x+1\right).\left(x^2-10x+16\right)\)
\(=\left(x+1\right).\left[\left(x^2-8x\right)-\left(2x-16\right)\right]\)
\(=\left(x+1\right)\left[x\left(x-8\right)-2\left(x-8\right)\right]\)
\(=\left(x+1\right)\left(x-2\right)\left(x-8\right)\)
x3 + 7x - 6=x2 . x + 7x - 22 + 2 = (x2 - 22) + (x+7x)+2=(x-2) . (x+2) + 8x + 2
x3 - 5x + 8x - 4=x2 . x -5x + 8x -22 = (x2 - 22) . (x -5x + 8x )=(x-2) . (x+2) . 4x
x3 - 9x2 + 6x + 16=x2 . x - 9x2 + 6x + 16 = (x2 - 9x2) . (x+6x) + 16=(x-9x) . (x+9x) . 7x + 16
k mk nha
x4+16= x4+ 24= (x+2)4