exam Maths Puzzle Numerical Ability

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#63 2x2-3x-9/2x2+3-9
^ the above is the power of 2 not multiply.

please show the process for solving. thanks

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exam Other Question

suppose x is equal to ab over a plus b and y is equal to ab over a minus b, show that y squared minus x squared all over y squared plus x squared is equal to 2ab over a squared plu Please help me solve this:

Find the zeros of the following functions.

f(x) = 4x^3-4x^2-7x-2