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Indicies C2 Question help?

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So like many, I'm studying for my C2 exam (Edexcel) this Wednesday coming. I've done well so far but I came across this one question in the book that has really stumped me. I mean I could solve it using logarithms, but since logs haven't been introduced at this stage in the book, I presume there is an alternative to solve it. Any suggestions or help? Thanks! (Just part A of question).
Original post by Jinds
image.jpg

So like many, I'm studying for my C2 exam (Edexcel) this Wednesday coming. I've done well so far but I came across this one question in the book that has really stumped me. I mean I could solve it using logarithms, but since logs haven't been introduced at this stage in the book, I presume there is an alternative to solve it. Any suggestions or help? Thanks! (Just part A of question).


yes it's easy

for A for example
let 3x=y3^x=y then solve as a quadratic
Original post by Jinds
image.jpg

So like many, I'm studying for my C2 exam (Edexcel) this Wednesday coming. I've done well so far but I came across this one question in the book that has really stumped me. I mean I could solve it using logarithms, but since logs haven't been introduced at this stage in the book, I presume there is an alternative to solve it. Any suggestions or help? Thanks! (Just part A of question).


This can also be used for equations like e^2x + ... + .. = 0 or something like that. You can substitute in something (u=3^x) and notice that u^2 = (3^x)^2 = 3^2x.
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Jinds
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Original post by thefatone
yes it's easy

for A for example
let 3x=y3^x=y then solve as a quadratic

Oh wow aha, I feel stupid now. Thanks! :smile:
Original post by Jinds
Oh wow aha, I feel stupid now. Thanks! :smile:


haha no problem :smile:

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