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

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

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- March 13th 2011, 03:06 AMjakethasnakeIndices Problem!
using indices only, and the substitution y=2^x , solve the equation:

2^2x - 6.2^x + 8 = 0 - March 13th 2011, 03:18 AMUnknown008
Okay, could you perform the substitution?

- March 13th 2011, 03:23 AMProve It
Maybe it will help if you rewrite your equation as

... - March 13th 2011, 03:28 AMjakethasnake
im lost as to where the substitution goes? and the question is written exactly as shown out of previous exam paper.

- March 13th 2011, 04:31 AMHallsofIvy
Look at Prove It's response. See those " "s? Replace

**those**with y. - March 13th 2011, 04:34 AMProve It