\(4^x-12.2^x+32=0\)
⇒ \(2^x.2^x-4.2^x-8.2^x+4.8=0\)
⇒ \(2^x\left(2^x-4\right)-8\left(2^x-4\right)=0\)
⇒ \(\left(2^x-4\right)\left(2^x-8\right)=0\)
⇒ \(\left[{}\begin{matrix}2^x-4=0\\2^x-8=0\end{matrix}\right.\)
⇒ \(\left[{}\begin{matrix}2^x=2^2\\2^x=2^3\end{matrix}\right.\)
⇒ \(\left[{}\begin{matrix}x=2\\x=3\end{matrix}\right.\)
Tìm x, y nguyên dương biết: \(x^2+2y^2+2xy-4x-3y-2=0\)
Tìm x biết :
a) x2\(-\)4x+4=25
b) \(\dfrac{x-17}{1990}\)+\(\dfrac{x-21}{1986}\)+\(\dfrac{x+1}{1004}\)=4
c) 4x\(-\)12.2x+32=0
P = (x + 1)(x + 2)(x + 3)(x + 4) - 32
Q = x2 - 2xy + y2 + 3x - 3y + 1
R = 4x2 + \(\dfrac{1}{x^2}\)-20 (x>0)
Tìm x biết:
4x2 - 6x = 0
b) 4x2 + 4x = -1
c) 5x2 + x = 0
d) x3 - 5x = 4x2
3x(x-2) = x-2
x3 - 16x = 0
tìm x ,biết :
a, x^2-3x = 0
b,x^5-9x = 0
c, ( x^3-4x^2) - ( x-4) = 0
d, (4x^2-25)^2- 9 ( 2x - 5 )^2= 0
Tìm x,y biết:
a) (2x+3).(x-2) -( x2 -4x + 4) = 0
b) 9x2 -( x2 - 4x +4) =0
tim x y z biết
a,4x^2+9y^2+4x-24y+17=0
b,2x^2+2y^2+z^2+2xy-2xz-6y+9=0
c,x^2+2y+2xy+2x+6y+5=0
Tìm x biết: \(x^2-4x+5=0\)
Tìm x, biết:
a) \(\left(2x-1\right)^2-4x^2+1=0\)
b) \(6x^3-24x=0\)
c) \(2x\left(x-3\right)-4x+12=0\)
d) \(x^3-5x^2+x-5=0\)
