exam Maths Puzzle Numerical Ability

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How do I solve
10x^2-16x+6=0

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exam Other Question

Use the given functions f and g to find f+g, f-g, fg, f/g. State the domain of each.

(a) f(x)=x^2-25 g(x)=x-5
(b) f(x)=v----x^2-9 g(x)=x-3

***v---- means square root
5x+6-2x=5