exam Maths Puzzle Numerical Ability

determine the lcd:can you show me step by step so i can finish the rest? thanks!

4 over x^2 - 6x minus 5 over x^2 - 36

7 over 4x^2y^6 plus 1 over 7x^3y^4

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exam Other Question

(10+(square root 20))-(4-(square root 45))
I got 12+2(square root 20)-2(square root 45)
Am I even close?
x + y=2

-3x +4y=36