exam Maths Puzzle Numerical Ability

please help me solve

(x^2 + 6x) - (2x^2 -3)

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exam Other Question

You go 50 km West, then 20 km North. How many km are you from where you started?

Can someone explain to me how to slove this question please and thank you. 10x^8y/24x^3y^5z