exam Maths Puzzle Numerical Ability

Find all solutions to the equation.
r(squared)-8t=-15

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exam Other Question

Use Cramer's rule to solve the following system of equations. If D=0, use another method to solve.
2x/3-5y/2=3/2
-x/4+5y/2=7/2 how do you solve this rational expression.... for allr is not equal to 2

r^2-5r+6/r^2-4 the answer is r-3/r+2 i just need to know how to get this answer.