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E = x^3 - 3x^2 + 7x^2 - 21x - 8x + 24
= x^2 ( x- 3 ) + 7x ( x- 3 ) - 8 ( x- 3 )
= ( x- 3 )(x^2 + 7x - 8 )
= ( x- 3 )[ x^2 + 8x - x - 8 )
= ( x -3 ) [ x(x + 8 ) - ( x + 8 ) ]
= ( x- 3 )( x - 1 )( x + 8)
=a3-3a2+7a2-21a-8a+24
=a2(a-3)+7a(a-3)-8(a-3)
=(a-3)(a2+7a-8)
=(a-3)(a2-a+8a-8)
=(a-3)(a+8)(a-1)
4a2=4b2-4a+1
=(2a)2-2*2a*1+12-4b2= (2a-1)2-(2b)2(2a-1-2b)(2a-1+2b)
a2 - 4a + 3
= a2 - a - 3a + 3
= a.(a - 1) - 3.(a - 1)
= (a - 1).(a - 3)
= \(a^2-3a-a+3\)= \(a\left(a-3\right)-\left(a-3\right)\)= \(\left(a-3\right)\left(a-1\right)\)
=(a2 +1)2-(2a)2
=(a2+1+2a)(a2+1-2a)
=(a+1)2(a-1)2
mình làm thế ko biết có đúng hay ko
( a2 + 1 )2 - 4a2
= ( a2 + 1 )2 - ( 2a )2
= ( a2 + 1 + 2a ) ( a2 + 1 - 2a )
........
a)\(\left(a^3-b^3\right)+\left(a-b\right)^2\)
\(=\left(a-b\right)\left(a^2+ab+b^2\right)+\left(a-b\right)^2\)
\(\left(a-b\right)\left(a^2+ab+b^2+a-b\right)\)
b) \(\left(8a^3-27b^3\right)-2a\left(4a^2-9b^2\right)\)
\(=\left(2a-3b\right)\left(4a^2+6ab+9b^2\right)-2a\left(2a-3b\right)\left(2a+3b\right)\)
\(=\left(2a-3b\right)\left(4a^2+6ab+9b^2-4a^2-6ab\right)\)
\(=\left(2a-3b\right)\cdot9b^2\)
\(=\left(a-b\right)\left(a^2+ab+b^2\right)+a^2-2ab+b^2\)
= ...........
\(4a^4b-24a^3b^2+36a^2b^3\)
\(=4a^2b\left(a^2-6ab+9b^2\right)\)
\(=4a^2b\left[a^2-2.a.3b+3b^2\right]\)
\(=4a^2b\left(a-3b\right)^2\)
\(4a^4b-24a^3b^2+36a^2b^3\)
\(=4a^2b\left(a^2-6ab+9b^2\right)\)
\(=4a^2b\left[a^2-2\cdot a\cdot3b+\left(3b\right)^2\right]\)
\(=4a^2b\left(a-3b\right)^2\)
\(a^3+4a^2+4a+3\)
\(=a^3+a^2+3a^2+3a+a+3\)
\(=\left(a^3+a^2+a\right)+\left(3a^2+3a+3\right)\)
\(=a\left(a^2+a+1\right)+3\left(a^2+a+1\right)\)
\(=\left(a+3\right)\left(a^2+a+1\right)\)