Year 12s: what will be the first way you research your future options? >>

Harder Indices question

Question 3a:
https://crashmaths.com/wp-content/uploads/2017/10/ASMPaper1SetA.pdf

Bit surprised by this question... didn't see anything like this in the textbook. Any help is welcome.

Reply 1

thekidwhogames

Convert all to powers of 2 and use the fact that root = power of half.

Reply 2

username3480226

Way easier than it looks. Your probably getting confused by the number of scary looking terms. Focus on 8^(y-3). From GCSE we cknow we can rewrite that as 8^y 8^-3. Then rearrange to get 8^y on one side, and use logs.