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\(x^4+2x^3-6x-9\)
\(=x^4-9+2x^3-6x\)
\(=\left(x^2-3\right)\left(x^2+3\right)+2x\left(x^2-3\right)\)
= \(\left(x^2-3\right)\left(x^2+3+2x\right)\)
Thợ Đào Mỏ Panda, mày bị điên à, không biết còn trả lời làm cái quái gì
a) x3-2x2-x+2
=x(x2-1)+2(-x2+1)
=x(x2-1)-2(x2-1)
=(x2-1)(x-2)
b)
x2+6x-y2+9
=x2+6x+9-y2
=(x+3)2-y2
=(x+3-y)(x+3+y)
\(2x^4+x^3-6x^2+x+2\)
= \(2x^4+4x^3-3x^3-6x^2+x+2\)
= \(2x^3\left(x+2\right)-3x^2\left(x+2\right)+\left(x+2\right)\)
= \(\left(x+2\right)\left(2x^3-3x^2+1\right)\)
=\(\left(x+2\right)\left(2x^3-2x^2-x^2+1\right)\)
=\(\left(x+2\right)\left(2x^2\left(x-1\right)-\left(x+1\right)\left(x-1\right)\right)\)
=\(\left(x+2\right)\left(x-1\right)\left(2x^2-x-1\right)\)
= \(\left(x+2\right)\left(x-1\right)\left(2x^2-2x+x-1\right)\)
=\(\left(x+2\right)\left(x-1\right)\left(2x\left(x-1\right)+\left(x-1\right)\right)\)
=\(\left(x+2\right)\left(2x+1\right)\left(x-1\right)^2\)
2x^5-6x^4-2a^2x^3-6ax^3
=(2x^5-2a^2x^3)-(6x^4+6ax^3)
=2x^3(x^2-a^2)-6x^3(x+a)
=2x^3(x-a)(x+a)-6x^3(x+a)
=(x+a)(2x^4-2x^3a-6x^3)
=(x+a) 2x^3 (x-a-3)
a,Ý NÀY SAI ĐẦU BÀI
b,\(=\left(x^4-x^3\right)+\left(x^2-1\right)\)
=\(x^3\left(x-1\right)+\left(x-1\right)\left(x+1\right)\)
=\(\left(x^3+1\right)\left(x-1\right)\)
k mk mk làm ý cuối cho
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x^2 - 2x - 15
= x^2 - 5x + 3x - 15
= ( x^2 + 3x ) - (5x +15 )
= x ( x +3 ) - 5 ( x + 3 )
(x + 3 ) ( x - 5 )
a: \(5x\left(2x+3\right)+6x+9\)
\(=5x\left(2x+3\right)+\left(6x+9\right)\)
\(=5x\left(2x+3\right)+3\left(2x+3\right)\)
\(=\left(2x+3\right)\left(5x+3\right)\)
b: \(3x\left(x+4\right)+48\left(x+4\right)+5\left(x+4\right)\)
\(=\left(x+4\right)\left(3x+48+5\right)\)
=(x+4)(3x+53)
\(=x^4-x^3+3x^3-3x^2+3x^2-3x+9x-9\\ =\left(x-1\right)\left(x^3+3x^2+3x+9\right)\\ =\left(x-1\right)\left(x+3\right)\left(x^2+3\right)\)
\(x^4+2x^3+6x-9=x^3\left(x-1\right)+3x^2\left(x-1\right)+3x\left(x-1\right)+9\left(x-1\right)\)
\(=\left(x-1\right)\left(x^3+3x^2+3x+9\right)\)
\(=\left(x-1\right)\left[x^2\left(x+3\right)+3\left(x+3\right)\right]\)
\(=\left(x-1\right)\left(x+3\right)\left(x^2+3\right)\)