Simultaneous Equations: Solving for Unknown Variables | Urgent Homework Help

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Homework Statement



Googd morning!
There is the exercise:
Solve the following simultaneous equation:

Homework Equations



a) x2+ 2xy=8, 3x-5y=1
b) (x+1)(x+2)=y, 2y-x=7

The Attempt at a Solution


Well, i don't really know how to start.
If someone can help me to know how to do for the first one i will try to do the second one.
Thank you!

It's URGENT! Please!
 
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Try rearranging the second equation and substituting into the first equation, so that you have one equation with only one variable.
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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