exam Maths Puzzle Numerical Ability

Simplify: 3√32 - 5√50 - 8√45 + 7√20

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exam Other Question

Divide: (2x^3 - x^2 + 3x - 1) / (x + 2) please show me how to do this.
Simplify the rational expression:
x2 - 3x - 10
x2 - x - 20