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Substitute 0 as x to get the y-intercept.

To get the intersections on the x-axis you need to factorise and then the x values that make each bracket zero is the value.

E.g.

x2 + 10x + 7 = 0

(x + 5)(x + 2) = 0

x1 = -5 , x2 = -2

So the y-intercept is 7, and the x-intercepts are at x=-5 and x=-2

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Q: X and y intercepts for a quadratic?
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Is it possible for the graph of a quadratic function to have two y-intercepts?

Yes. A quadratic function can have 0, 1, or 2 x-intercepts, and 0, 1, or 2 y-intercepts.


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