exam Maths Puzzle Numerical Ability

Tutor could you please help me to simplify the following?

12x^2+4x-1/2x+1

and

x^2+3x-4/x^2-x-20

Thank You

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exam Other Question

I need the coordinates of the x-intercept. I think it is either (-6, 0) or (-3,0)
I am not sure if either of these pairs are correct, or if I have them in right order. I am so confused.

Thank you, Ellen 2
- x = -14
3