exam Maths Puzzle Numerical Ability

Simplify:
(7x^2+3x-9)-(-x^2+8x-3)

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exam Other Question

I also wanted to thank everyone that has helped me with my many problems, I am so bad with math. I also want to thank the ones that explain how things are done or how you "come up" The square root of 32x + the square root of 2x - the square root of 18x =?

Please help!