2010 · Q26
What are the roots of the equation 4^x - 3·2^(x+2) + 32 = 0 ?
Elementary MathematicsAlgebra
- A1, 2
- B3, 4
- C2, 3
- D1, 3
Explanation
t=2^x gives t²-12t+32=0, t=4 or 8, so x=2 or 3.
What are the roots of the equation 4^x - 3·2^(x+2) + 32 = 0 ?
Explanation
t=2^x gives t²-12t+32=0, t=4 or 8, so x=2 or 3.