exam Maths Puzzle Numerical Ability

P(x)=x^2-3xy+y^2
r=-5x^2+2xy-3y^2

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exam Other Question

multiply and simplify:

x^5y^3/x^2+13x+30 multiplication sign x^2+2x-3/x^7y^2

Thanks soooo much ! Assume the following axioms are satisfied...

1) For every two distinct points, there is a unique line containing both points.
2) every two distinct lines have a unique point in