book Maths Puzzle Numerical Ability

Find the point of the intersection of the following system of equations algebraically

x^2-Y=5
and 2X+y=3

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book Other Question

p(x)=x^3-(a+1)x^2+(a-6)x+6a where x is the variable and z is a parameter. P has two more real roots they are ____ and ____. we are stuck trying to solve this type of problem:

4a to the third power over 20a to the sixth power
we need help dividing exponents