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Home > CAAC > Chapter 12 > Lesson 12.4.4 > Problem 12-101

12-101.

Find the minimum (the lowest point) of the function f(x) = 3x2 + 15x − 18. Explain how you know it is the lowest. Homework Help ✎

The vertex is the lowest point of a parabola.

The x-coordinate of the vertex is halfway between the x-intercepts.

Substitute the x-coordinate of the vertex back into the equation to find the y-coordinate.

( −2.5, −36.75 )