Exam Maths Puzzle Algebra

How would I do 2y^2 = 3y + 4 using the Quadratic formula and also how would I do x^2 = 4x using the quadratic formula?

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Exam Other Question

What is f^-1(x) if f(x)=1/2x-3?
would the answer be f^-1(x)=1/2x+3? if not what? If my sales were at 100,000 last year and 400,000 this year what was the percentage increase?