book Maths Puzzle Numerical Ability

I have an extra credit problem in my college algebra class.
I need to solve for x from the standard quadratic equation ax^2 + bx + c=0 to end as a result as the quadratic formula! Any advice?

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I am stuck on a quadratic graph question.

y = (x-2)squared,

sorry i can`t do a little 2 so i put squared, i can do other quadratic graphs and the working, but can`t find how to solve this 1 What is the March sales revenue if April $11,000 and March is 10% less. What is the March sales revenue if April sales is $70,000 and March is 25% less.