\(x^2-7x=60\)
\(\Leftrightarrow x^2-12x+5x-60=0\)
\(\Leftrightarrow x\left(x-12\right)+5\left(x-12\right)=0\)
\(\Leftrightarrow\left(x+5\right)\left(x-12\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-5\\x=12\end{matrix}\right.\)
*tìm x:
7x(2x-5)-14x(x+2)=60
Tính:
a) \(\left(6x^3-7x^2-x+2\right):\left(2x+1\right)\)
b) \(\left(2x^2-21x^2+67x-60\right):\left(x-5\right)\)
Phân tích thành nhân tử: \(\left(x^2-7x+12\right)\left(x^2-15x+56\right)-60\)
Phân tích đa thức thành nhân tử
a) 5x2 + 8x -13
b) x2 +19x+60
c) 2x2 - 7x +3
d ) x2 - 7x+ 4
giải các phương trình
a) (3x-2)(3x-1) = (3x+1)2
b) (4x-1)(x+1) = (2x-3)2
c) (5x+1)2 = (7x-3)(7x+2)
d) (4-3x)(4+3x)=(9x-3)(1-x)
e) x(x+1)(x+2)(x+3)=24
g) (7x - 2)2= (7x-3)(7x+2)
x^4-7x^3+14x^2-7x+1
(x+1)^4+(x^2+x+x)^2
Rút gọn
A. ( x -5 ) ( 7x +1 ) - 7x ( x+3)
B. ( x-2)2 - ( x-1) ( x+1)
RUT GON BIEU THUC:
\(A=3x^{n-2}\left(x^{n+2}-y^{n+2}\right)+y^{n+2}\left(3x^{n-2}-y^{n-2}\right)\)
\(B=x^{10}-7x^9+7x^8-7x^7+...+7x^2-7x+2\)
4. x^2 − 5x + 6
5. x^2+7x+10
6. x + 7√x + 10
7. 3x^4 + 7x^2 + 4
8. x^2-x-2
9. x^6 − x^3 − 2
