Hello,
Is the answer not meant to be ±1/125 ?
I'd of thought that taking square root of 25 will give ±5 and then putting that to the power of -3 would give ±1/125?
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Aug 29, 2020 11:05 am
5 Replies
Aug 29, 2020 1:52 pm
You’re correct
Aug 30, 2020 12:19 pm
I found this rule in my textbook, which I've never seen in my life lol (And I finished A-Level Maths last year).
Still kinda confused about the rule.
if a^1/2 = √a
and we only take the positive root, why don't we do this if it's the other way round?
i.e. if √a = a^1/2, why do we take both the positive and negative roots if its basically the same thing as above?
Aug 30, 2020 2:21 pm
Aug 31, 2020 11:22 pm
Aug 31, 2020 11:30 pm
Loool
I did a bit of research and basically it looks like to the power of half means "the principal square root", i.e. it should only give positive numbers
So that solution that you just posted which contradicts that, I reckon the worker from edexcel that wrote the solution didn't know about that
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