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a: =64x^4+16x^2y^2+y^4-16x^2y^2
=(8x^2+y^2)^2-(4xy)^2
=(8x^2+y^2-4xy)(8x^2+y^2+4xy)
b: =x^8+2x^4+1-x^4
=(x^4+1)^2-x^4
=(x^4-x^2+1)(x^4+x^2+1)
=(x^4-x^2+1)(x^4+2x^2+1-x^2)
=(x^4-x^2+1)(x^2+1-x)(x^2+x+1)
c: =(x+1)(x^2-x+1)+2x(x+1)
=(x+1)(x^2-x+1+2x)
=(x+1)(x^2+x+1)
d: =(x^2-1)(x^2+1)-2x(x^2-1)
=(x^2-1)(x^2-2x+1)
=(x-1)^2*(x-1)(x+1)
=(x+1)(x-1)^3
\(x^4+4x^2-5\)
\(=\left(x^4+4x^2+4\right)-9\)
\(=\left(x^2+2\right)^2-9\)
\(=\left(x^2+2+3\right)\left(x^2+2-3\right)\)
\(=\left(x^2+5\right)\left(x^2-1\right)\)
\(P=\left(a^8+2a^4b^4+b^8\right)-a^4b^4\)
\(P=\left(a^4+b^4\right)^2-a^4b^4\)
\(P=\left(a^4+b^4+a^2b^2\right)\left(a^4+b^4-a^2b^2\right)\)
\(P=\left[\left(a^2+b^2\right)^2-a^2b^2\right]\left(a^4+b^4-a^2b^2\right)\)
\(P=\left(a^2+b^2+ab\right)\left(a^2+b^2-ab\right)\left(a^4+b^4-a^2b^2\right)\)
\(P=\left[\left(a+b\right)^2-ab\right]\left(a^2+b^2-ab\right)\left(a^4+b^4-a^2b^2\right)\)
\(P=\left(a+b+\sqrt{ab}\right)\left(a+b-\sqrt{ab}\right)\left(a^2+b^2-ab\right)\left(a^4+b^4-a^2b^2\right)\)
\(A=b^4-9a^2-4b^2+4=b^4-4b^2+4-9a^2\)
\(=\left(b^2-2\right)^2-9a^2\)
\(=\left(b^2-2+3a\right)\left(b^2-2-3a\right)\)
\(A=b^4-9a^2-4b^2+4\)
\(A=\left(b^2\right)^2-2.2.b^2+2^2-9a^2\)
\(A=\left(b^2-2\right)^2-\left(3a\right)^2\)
\(A=\left(b^2-2-3a\right)\left(b^2-2+3a\right)\)
_Hắc phong_
\(a^4-4b^2\)
\(=\left(a^2\right)^2-\left(2b\right)^2\)
\(=\left(a^2-2b\right)\left(a^2+2b\right)\)
Bài làm
a4 - 4b2
= ( a2 )2 - ( 2b )2
= ( a2 - 2b )( a2 + 2b )
# Học tốt #
3x^2 - 8x + 4
= 3x^2 - 6x - 2x + 4
=( 3x^2 - 6x ) - ( 2x - 4)
=3x(x-2) - 2(x-2)
=(3x-2) - (x-2)
Ta có : \(a^4+4b^4=\left[\left(a^2\right)^2+2.a^2.2b^2+\left(2b^2\right)^2\right]-4a^2b^2=\left(a^2+2b^2\right)^2-\left(2ab\right)^2\)
\(=\left(a^2+2b^2-2ab\right)\left(a^2+2b^2+2ab\right)\)