Phân tích đa thức thành nhân tử:
7a - 7b + a^2 - b^2
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16 tháng 11 2021
\(7a^2-7ax-9a+9x=\left(7a^2-7ax\right)-\left(9a-9x\right)=7a\left(a-x\right)-9\left(a-x\right)=\left(a-x\right)\left(7a-9\right)\)
29 tháng 7 2017
\(a^3+4a^2-7a-10\)
\(=\left(a^3+5a^2\right)-\left(a^2+5a\right)-\left(2a+10\right)\)
\(=a^2\left(a+5\right)-a\left(a+5\right)-2\left(a+5\right)\)
\(=\left(a^2-a-2\right)\left(a+5\right)\)
\(=\left(a^2-2a+a-2\right)\left(a+5\right)\)
\(=\left[a\left(a-2\right)+\left(a-2\right)\right]\left(a+5\right)\)
\(=\left(a+1\right)\left(a-2\right)\left(a+5\right)\)
12 tháng 10 2021
\(1,\\ a,=4\left(x-2\right)^2+y\left(x-2\right)=\left(4x-8+y\right)\left(x-2\right)\\ b,=3a^2\left(x-y\right)+ab\left(x-y\right)=a\left(3a+b\right)\left(x-y\right)\\ 2,\\ a,=\left(x-y\right)\left[x\left(x-y\right)^2-y-y^2\right]\\ =\left(x-y\right)\left(x^3-2x^2y+xy^2-y-y^2\right)\\ b,=2ax^2\left(x+3\right)+6a\left(x+3\right)\\ =2a\left(x^2+3\right)\left(x+3\right)\\ 3,\\ a,=xy\left(x-y\right)-3\left(x-y\right)=\left(xy-3\right)\left(x-y\right)\\ b,Sửa:3ax^2+3bx^2+ax+bx+5a+5b\\ =3x^2\left(a+b\right)+x\left(a+b\right)+5\left(a+b\right)\\ =\left(3x^2+x+5\right)\left(a+b\right)\\ 4,\\ A=\left(b+3\right)\left(a-b\right)\\ A=\left(1997+3\right)\left(2003-1997\right)=2000\cdot6=12000\\ 5,\\ a,\Leftrightarrow\left(x-2017\right)\left(8x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2017\\x=\dfrac{1}{4}\end{matrix}\right.\\ b,\Leftrightarrow\left(x-1\right)\left(x^2-16\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=4\\x=-4\end{matrix}\right.\)
TV
2
NK
0
NK
2
2 tháng 11 2016
\(a^3+4a^2-7a-10\)
\(=a^3+3a^2+a^2-10a+3a-10\)
\(=\left(a^3+a^2\right)+\left(3a^2+3a\right)-\left(10a+10\right)\)
\(=a^2\left(a+1\right)+3a\left(a+1\right)-10\left(a+1\right)\)
\(=\left(a+1\right)\left(a^2+3a-10\right)\)
\(=\left(a+1\right)\left[\left(a^2+5a-2a-10\right)\right]\)
\(=\left(a+1\right)\left[a\left(a+5\right)-2\left(a+5\right)\right]\)
\(=\left(a+1\right)\left(a+5\right)\left(a-2\right)\)
KC
2
15 tháng 6 2015
= 2( a^3 + b^3 ) + 7ab(a+b) = 2(a+b)(a^2 -ab +b^2) + 7ab(a+b) = (a+b) ( 2a^2 - 2ab + 2b^2 - 7ab)
=(a +b ) ( 2a^2 +2b^2 - 9ab)
\(=7\left(a-b\right)+\left(a-b\right)\left(a+b\right)=\left(a-b\right)\left(7+a+b\right)\)
\(7a-7b+a^2-b^2\)
\(=7\left(a-b\right)+\left(a-b\right)\left(a+b\right)\)
\(=\left(a-b\right)\left(a+b+7\right)\)