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brilliants [131]
3 years ago
12

How do you find the vertex & how do you know if a graph opens up or down help please asap

Mathematics
1 answer:
alex41 [277]3 years ago
8 0
Standard form of a quadratic f(x) = ax^2 + bx + c
In a quadratic function you find the vertex using the formula x = -b/2a; once you find the x value, substitute it into the equation and solve for y.
To know if a parabola opens up or down you look at the coefficient of the x^2 term. If it is positive, the graph opens up; if it is negative, the graph opens down.
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