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b)\(\left(x^2-8\right)^2+36\)
\(=x^4-16x^2+100\)
\(=x^4+20x^2+100-36x^2\)
\(=\left(x^2+10\right)^2-36x^2\)
\(=\left(x^2-6x+10\right)\left(x^2+6x+10\right)\)
c)81x4+4
=81x4+36x2+4-36x2
=(9x2+2)2-(6x)2
=(9x2+6x+2)(9x2-6x+2)
\(x^4+4=\left(x^2\right)^2+2^2\)
\(=\left(x^2+2\right)^2-2.x^2.2=\left(x^2+2\right)^2-\left(2x\right)^2\)
\(=\left(x^2+2x+2\right)\left(x^2-2x+2\right)\)
\(4x^4+y^4\)
\(=\left(2x^2+y^2\right)^2-\left(2xy\right)^2\)
\(=\left(2x^2+y^2+2xy\right)\left(2x^2+y^2-2xy\right)\)
\(x^4+64\)
\(=\left(x^2\right)^2+8^2+2x^2.8-2x^2.8\)
\(=\left(x^2+8\right)^2-\left(4x^2\right)\)
\(=\left(x^2-4x+8\right)\left(x^2+4x+8\right)\)
\(x^8+3x^4+4\)
\(=x^8+4x^4+4-x^4\)
\(=\left(x^4-2\right)^2-x^4\)
\(=\left(x^4-x^2-2\right)\left(x^4-x^2-2x^2-2\right)\)
\(=\left(x^2-2\right)\left(x^2+1\right)\left(x^2-1\right)\left(x^2+2\right)\)
\(=\left(x-1\right)\left(x+1\right)\left(x^2-2\right)\left(x^2+1\right)\left(x^2+2\right)\)
\(x^4+3x^2-4\)
\(=x^4+4x^2-x^2-4\)
\(=x^2\left(x^2+4\right)-\left(x^2+4\right)\)
\(=\left(x^2+4\right)\left(x^2-1\right)\)
\(=\left(x^2+4\right)\left(x-1\right)\left(x+1\right)\)
Chúc bạn học tốt.
\(x^4+y^4\)
= \(\left(x^2\right)^2+\left(y^2\right)^2+2x^2y^2-2x^2y^2\)
= \(\left(x^2+y^2\right)^2-2x^2y^2\)
= \(\left(x^2+y^2-\sqrt{2}xy\right)\left(x^2+y^2+\sqrt{2}xy\right)\)
Chúc bạn học tốt !!!
Bài làm
x4 + y4
= ( x2 )2 + 2x2y2 + ( y2 )2 - 2x2y2
= [ ( x2 )2 + 2x2y2 + ( y2 )2 ] - 2x2y2
= ( x2 + y2 )2 - 2x2y2
= ( x2 + y2 )2 - ( \(\sqrt{2}xy\))2
= ( x2 + y2 - \(\sqrt{2}xy\))( x2 + y2 + \(\sqrt{2}xy\))
# Học tốt #
x^4+4
=(x^2)^2+4x^2+4-4x^2
=(x^2+2)^2-4x^2
=(x^2-2x+2)(x^2+2x+2)
81x^4+4
=(9x^2)^2+36x^2+2^2-36x^2
=(9x^2)^2+36x^2+2^2-(6x)^2
=(9x^2+2)^2-(6x)^2
=(9x^2+2-6x)(9x^2+2+6x)
81x4 + 4 = ( 9x2)2 + 2 2 = ( 9x2)2 + 36x2 + 22 - 36x2 = (9x2 + 2)2 - (6x)2 = (9x2 + 2 - 6x)(9x2 + 2 + 6x)
XONG