exam Maths Puzzle Numerical Ability

Add or subtract as indicated. Express your result in simplest form.

4y/y^2 + 6y + 5 + 2y/y^2 - 1

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exam Other Question

I dont know how to solve these problems completely.
1. 20x^4-12x^3+8x^2

2.6x^2+2x-20

3.5w^2-20

4.5y^4-405 If Y = 4x3 - 4x + 10, what is the value of Y when x = -2?