Book Maths Puzzle Geometry

How do you figure out the length of a side of a right angle when you know the length of the other two sides?

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Sorry, long time since I've done maths! The question is "find a formula for the quadratic function as shown." The intercepts are (x= -1,y=2,) ( x=1, y=0 )and (x= -3, y=0.) Thanks for your time and help. Re: quadratic with y=2 and x= -1, the parabolic graph is reversed, ie. vertex is at (-1, 2). It also appears that when x=1, y=0 and when x= -3, y=0.