exam Maths Puzzle Numerical Ability

Add or subtract as indicated. Express your result in simplest form
3/ x^2 + 4x +3 - 1/ x^2 - 9

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exam Other Question

solve:

a^N=a^1 + (n-1)d for d
I have two problems that I am having a difficult time with. Could you please assist me with solving these:

4/x to the 2 power +3x-10 + 3/x to the 2 power -25 -5/x to th