book Maths Puzzle Numerical Ability

i need some one to give the steps one by one for this problem.

f(x)=2x^2-x^4+5x^2-x if f(x)=3

i'm using the synthetic substituion of polynomials

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book Other Question

the difference between a number and its riciprocal is 16 over 15. find the number. Compute the value of the discriminant and give the number of real solutions to the quadratic equation:

3x^2 - 7x + 9 = 0