what is (256y^256)^1/8
why is it 2y^32 and not 2y^2
The mark scheme states that the answer is 2y^32
Quick Past paper question watch
- Thread Starter
- 21-04-2016 17:43
- 21-04-2016 18:45
I'm not exactly good at explaining maths however if you 8th root 256 to get 2, you can't just 8th root its power.
Lets do the fourth root of 4^4
Would you agree that:
4^4 = 256 (just a coincidence)
And the fourth root 4^4 is therefore 4. This is the correct way.
However, you are rooting the power to get this:
4^2 - this is wrong
4^2 is 16 and the fourth root of 16 is 2.
I know this is an awful example but I'm awful at explaining things + I'm also doing GCSE .-.