\(x^2-6x-7=0\)
\(\Rightarrow x\left(x-7\right)+\left(x-7\right)=0\)
\(\Rightarrow\left(x-7\right)\left(x+1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=7\\x=-1\end{matrix}\right.\)
Tìm x:
a) x^2-4x-7=0
b) x^2-x-11=0
c) 2x^4-6x^3+x^2+6x-3=0
7)(16-8x)(2-6x)=0
8) (x+4)(6x-12)=0
9) (11-33x)(x+11)=0
10) (x-1/4)(x+5/6)=0
11) (7/8-2x)(3x+1/3)=0
12)3x-2x^2=0
Bài 4: Tìm x, biết.
a) 4x(x - 7) - 4x2 = 56
b) 12x(3x - 2) - (4 - 6x) = 0
c) 4(x - 5) - (5 - x)2 = 0
d) x(x +1) - x(x - 3) = 0
e) - 6x + 8 = 0 f) 2 + 2x + = 0
Tìm x
a, x\(^2\)-6x=-9
b, 2(x+3)-x\(^2\)+3x=0
c, x\(^3\)-6x\(^2\)+12x-7=0
Giải các phương trình:
a) 3 x − 3 4 − 2 − 4 x = 0 ;
b) x 2 − 4 x + 7 − 12 x + 7 = 0 ;
c) 4 − 4 + x + x x 2 − 16 = 0 ;
d) x 2 + 6 x − 7 = 0 .
Tìm x:
x2+6x-7=0
. Tìm x, biết:
a) 4x2 – 9 = 0
b) (x + 5)2 – (x – 1)2= 0
c) x2 – 6x – 7 = 0
d) (x + 1)2 – (2x - 1)2 = 0
K.(3x-1)(2x+7)-(x+1)(6x-5)=16
L.4x(x-7)=(x-7)
M.2(x+15)-x^2-5x=0
N.(x-2)^2-16=0
Tìm cặp số nguyên (x,y) biết:
a, x.(y-7)+y-12=0
b, xy-6x-4y+13=0
c, xy+3y-4x+15=0
