Book Maths Puzzle Quadratic Equations

For what values of y does the equation y = x squared have
a. No real solution?
b. Only one solution?
c. Two solutions?

I need an answer for all a-b

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I am looking at how to solve 1/a + 1/b = 37/180
Can you explain this to me or tell me where to go to learn how to do this?
Thank you,
Nancy
For what values of y does the equation y = x squared have

a. No real solution?
b. Only one solution?
c. Two solutions?