book Maths Puzzle Numerical Ability

I NEED HELP WITH:
(x^2 - 3x + 5)+(x^2 + 2x - 3)

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book Other Question

Multipy the rational expression. Simplify the result.

(x^2 - 2x/x^2 + 2x + 1) * (x^2 + 4x + 3/x^2 + 3x)
The sum of 3 consecutive intergers is less thank 200.What are the largest values for the intergers?