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The y-intercept is easy to find. Substitute 0 for x. It crosses the y-axis at 20, (0,20).

To find the x- intercepts substitute 0 for y and solve. Since this creates a quadratic equation, it is a little harder.

0 = x2 + 9x + 20, can be solved by several methods, factoring is easiest.

(x+5)(x+4) = 0

x = -5 and x = -4

So it crosses the x-axis at two points, -5 and -4, (-5,0) and (-4,0)

Q: Where does y equals x2 plus 9x plus 20 cross the x and y axis?

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