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 ( 31+ )
Otras preguntas
You and your brother are readibg the same novel you wnat to get ahead of him in the book so you decide to read 30 minutes longer than your brother reads how man
112 dollars converted to cents
Which of the following is a country where several European powers created spheres of influence? Great Britain China Japan France
How does Brainly.com work
Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsa
The Columbian Exchange is a term for the exchange of crops, animals, and disease between the Americas and Europe and Africa. true or false
Size of U.S. States The total surface area (in square miles) for each of six selected eastern states is listed here. 28,995 PA 37,534 FL 31,361 NY 27,087 VA 20,
The Silver Town people went to a fancy restaurant after the big event. Grammy gave the server a $15 tip. If the tip was 20% of the cost of dinner, how much was
The stage manager of a school play creates a rectangular acting area of 42 square yards. String lights will outline the acting area. To the nearest whole number
write and solve an equation to find three consecutive odd integers whose sum is 3
