earevalo106
earevalo106
26-05-2015
Mathematics
contestada
2^(2x)+2^(x+2)−12=0
|
Solve for x
Answer
Respuesta :
crisforp
crisforp
26-05-2015
2^(2x) = (2^x)^2 ;
2^(x+2) = (2^x) × 4 ;
Let be 2^x = y > 0 ;
y^2 + 4y - 12 = 0 ;
a = 1 ;
b = 4 ;
c = - 12 ;
b^2 - 4ac = 16 + 48 = 64 ;
y1 = ( - 4 + 8 ) / 2 = 2 > 0 ( correct ) ;
y2 = ( - 4 - 8 ) / 2 = - 6 > 0 ( false ) ;
Then, 2^x = 2 ;
x = 1.
Answer Link
VER TODAS LAS RESPUESTAS ( 33+ )
Otras preguntas
while designing relational database using class diagram, to represent one-to-many relationships, we add _________ to the tables.
In triangle JKL, KL ≈ JK and angle K = 91°. Find angle J.
An intrusive rock forms when a.rocks are weathered b.magma cools underground c.magma erupts and cools on the surface d.sediments are lithified
What do the situations in Venezuela, Vietnam and Ethiopia have in common?
Robotica en la aeronautica
6. (-/2 Points] DETAILS LARCALC11 13.3.021. Find both first partial derivatives. az ax = az = ay Need Help? Read It Watch It
To the nearest hundredth, what is the value of x? L 17° 12 X M K
let f be the following piecewise-defined function. f(x) x^2 2 fox x< 3 3x 2 for x>3 (a) is f continuous at x=3? (b) is f differentiable at x=3?
a trash compactor can compress its contents to 0.350 times their original volume. neglecting the mass of air expelled, by what factor is the density of the rubb
when aqueous solutions of cacl2(aq) and na2co3(aq) are mixed, the products are nacl(aq) and caco3(s). what are the spectator ions in this reaction?
