(Aust)Yr11 logs assignment (Due nxt Thur)

Hi everyone, thank you for your help. First of all, i dont expect a straightforward answer, more like hints and clues to work it out myself so i can actually learn something.

Eq1) 5x2^(x+1) - 12 = 0

eq2) 3x2^x = 4x3^(-x)+7

a) Which one of the above can NOT be solved using logs?

b) Solve the equation that is the answer to (a) using a G.C. Give a sketch of your solution.

c) Solve the other equation using logs and give answer in log form.

[by the way, how do you type in the equations as you would actually write them?]

Construct an exponential equation that follows this graph :

http://img484.imageshack.us/img484/2...expohl0.th.png

Written in the form y = a X b^(cx) + d

= a X (b^c)^x + d

a X k^x + d

Thank you!