exam Maths Puzzle Numerical Ability

Add and express in the simplest form

4x/x^2-18x+72 + 4/x-6

Thanks

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exam Other Question

I need help factoring these polynomials completely.

20x squared - 7x - 6

ab - a - b + 1

and -8z squared + 48z - 72 I need help i have been trying to figure out this question all day can you help me figure it out

9/10 - 4/12