Question

Identify the vertex for the graph of y = -3x2 + 6x - 4.

(1, 5)
(1, -1)
(-1, -13)
(-1, -9)
Fan and Medal... someone please help!!

Answer 1

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Answer 2

You can complete the square to write the given equation in vertex form to find the vertex. Another way is to find the value of -b/2a, which is the x-coordinate of the vertex. Then substitute the value of -b/2a in for x and find y, and this will be the y-coordinate of the vertex. You can also find the average of the zero's (the x-intercepts) of the function, and then substitute this average in for x to find y, to find the vertex. Similarly you can find the vertex by partial factoring. You can also use calculus to find the vertex but I have a feeling you're too young to have learned calculus so then stick with one of the other methods. Good Luck!

Answer 3

Thanks ... :D @calculusfunctions

Answer 4

Welcome! I hope that means you know how to use one or more of those methods and hence solve the problem on your own.