exam Maths Puzzle Numerical Ability

Please help me with thses 2 problems and thanks


Factor completely: 9x^2-16y^2

Factor completely: 3x^2-2x-8

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exam Other Question

Would you please help me with this problem ;0).
x over x-2, subtract x+1 over x = 8 over x^2-2x

I think the LCD is x^2-2x. I am lost from here. Thank you for your help.
is this perpendicular