Thread: Indices Problem!

using indices only, and the substitution y=2^x , solve the equation:

2^2x - 6.2^x + 8 = 0

Okay, could you perform the substitution?

Maybe it will help if you rewrite your equation as

...

im lost as to where the substitution goes? and the question is written exactly as shown out of previous exam paper.

Look at Prove It's response. See those " "s? Replace those with y.

Originally Posted by HallsofIvy

Look at Prove It's response. See those " "s? Replace those with y.

And once you have done that, solve for , the solution of which you can use to solve for .