Stu

What does the C represent?

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You way will be nicest solve. No point dancing around the bush now. Getting to the neatest solution is always more benificial and makes life easier. I meant literally dancing around a bush wasting time going backwards to do that way. Should be bonus marks not less marks if solved with a 3x3 and in one go. lol. 

Thanks. Smart lady!

Can you explain the following further please? 

7^4 = 49^2=(50-1)^2=2500-100+1=2401

I know. It's there now for the search engine and for op to develop a desire to question. Unless it just makes the person confused, but in which case it will either be ignored or start a discussion in my opinion. As well, it is relevant to this part of learning in maths so when the op gets a negative inside a sqrt they know what they can and can't do with it. ;) 

You cannot Sqrt a negative number if this comes up. It would become a complex number. Unless you take the absolute value in which case you can just Sqrt the positive I believe. Just for reference. 

Your general welfare of the countries, or the welfare system? 

Do it for your self! Good luck.

For questions like this you should be registered as a member for the best feedback.

What is the formula to solve 7^765 * 7^450 * 7^-822 * 7^-389.
This type of question from a member will get the best reply.

Or really. I thought the lecturer just wanted to resolve using two equations. Though taking the inverse of a 3x2 matrix might not have been posible right? Hope I can transpose it now, knowing what i want to achieve. I wouldn't have known to invole Q and tbh I don't know why but I was just confused about how to transpose it. I think that it is an area for development this weekend to be honest and next week with Maths stupports. Really exceptional and I will do the rest.