exam Maths Puzzle Numerical Ability

I couldnt figure out this factoring problem

4x^2+16xy-9y^2

THANKS FOR THE HELP

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exam Other Question

how do i solve this problem?

f=z(p+b) divided by 8 One number is 3 times another. If the sum of their reciprocals is 4/21, find the two numbers.

I think I can solve the equation if I could figure out how to set it up.

Thanks