a. vertex

b. x-intercepts

c. y-intercepts

d. none of the above

a. vertex

b. x-intercepts

c. y-intercepts

d. none of the above

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Another name is the zeros of the function, when y is zero, the graph cross the x-axis

The answer is x-intercepts, Nataliya already answer the question. I just add some explanations to it.

If b^{^2} - 4ac >0

X_{ vertex } is half way between roots.

Roots are ( X_{1, }X_{2) }X _{vertex } = ( X_{1 + }X _{2 }) / 2, Y intercept is always equal c ,

So having all this information you can plot the curve.

If b^{2 }- 4ac <0 , then there is no X intercept, only find the vertex X_{vertex =
}-b/2a, and Y intercept = c.

b. x-intercepts

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