exam Maths Puzzle Numerical Ability

Find CGF - Factor Out, Pease help
15x^2y^2-9xy^2+6x^2y
Thank you

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exam Other Question

2x+y=16
3x-y=4
I need to solve for x and y
Can anyone give me a hand with this one? Thanks!

3^x-1 = 2

Give answer to four decimal places. Thanks again!