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10 tháng 10 2021

\(x^2\left(4-x\right)+9\left(4-x\right)=\left(x^2+9\right)\left(4-x\right)\)

\(x^2-9-4\left(x+3\right)\)

\(=\left(x-3\right)\left(x+3\right)-4\left(x+3\right)\)

\(=\left(x+3\right)\left(x-3-4\right)\)

\(=\left(x+3\right)\left(x-7\right)\)

x2 - 9 - 4(x + 3)

= (x2 - 9) - 4(x + 3)

= (x2 - 32) - 4(x + 3)

= (x - 3) (x + 3) - 4(x + 3)

= (x + 3) (x -  3 - 4)

= (x + 3)  ( x - 7)

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6 tháng 8 2016

\(x^2-9-4\left(x+3\right)\)

\(=\left(x-3\right)\left(x+3\right)-4\left(x+3\right)\)

\(=\left(x+3\right)\left(x-3-4\right)\)

\(=\left(x+3\right)\left(x-7\right)\)

6 tháng 8 2016

\(x^2-9-4\left(x+3\right)\)

\(=\left(x^2-9\right)-4\left(x+3\right)\)

\(=\left(x^2-3^2\right)-4\left(x+3\right)\)

\(=\left(x-3\right)\left(x+3\right)-4\left(x+3\right)\)

\(=\left(x+3\right)\left(x-3-4\right)\)

\(=\left(x+3\right)\left(x-7\right)\)

24 tháng 9 2021

\(1,\\ 1,=15\left(x+y\right)\\ 2,=4\left(2x-3y\right)\\ 3,=x\left(y-1\right)\\ 4,=2x\left(2x-3\right)\\ 2,\\ 1,=\left(x+y\right)\left(2-5a\right)\\ 2,=\left(x-5\right)\left(a^2-3\right)\\ 3,=\left(a-b\right)\left(4x+6xy\right)=2x\left(2+3y\right)\left(a-b\right)\\ 4,=\left(x-1\right)\left(3x+5\right)\\ 3,\\ A=13\left(87+12+1\right)=13\cdot100=1300\\ B=\left(x-3\right)\left(2x+y\right)=\left(13-3\right)\left(26+4\right)=10\cdot30=300\\ 4,\\ 1,\Rightarrow\left(x-5\right)\left(x-2\right)=0\Rightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\\ 2,\Rightarrow\left(x-7\right)\left(x+2\right)=0\Rightarrow\left[{}\begin{matrix}x=7\\x=-2\end{matrix}\right.\\ 3,\Rightarrow\left(3x-1\right)\left(x-4\right)=0\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=4\end{matrix}\right.\\ 4,\Rightarrow\left(2x+3\right)\left(2x-1\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=-\dfrac{3}{2}\\x=\dfrac{1}{2}\end{matrix}\right.\)

17 tháng 7 2017

Ta có : 

\(x^4-x^3-x^2+1=\left(x^4-x^3\right)-\left(x^2-1\right)=x^3.\left(x-1\right)-\left(x+1\right).\left(x-1\right)\)

\(=\left(x-1\right).\left(x^3-x-1\right)\)

26 tháng 6 2021

`a)3x-3a+yx-ya`

`=3(x-a)+y(x-a)`

`=(x-a)(y+3)`

`b)x^2-9-4(x+3)`

`=(x-3)(x+3)-4(x+3)`

`=(x+3)(x-3-4)`

`=(x+3)(x-7)`

26 tháng 6 2021

a)  \(=3x+yx-\left(3a+ya\right)\) \(=x\left(3+y\right)-a\left(3+y\right)\) \(=\left(3+y\right)\left(x-a\right)\)

b) \(=\left(x-3\right)\left(x+3\right)-4\left(x+3\right)\)  \(=\left(x+3\right)\left(x-3-4\right)\) \(=\left(x+3\right)\left(x-7\right)\)