What is the first step when rewriting y = 3x2 + 9x – 18 in the form y = a(x – h)2 + k? 3 must be factored from 3x2 + 9x x must be factored from 3x2 + 9x 9 must be factored from 9x – 18 3 must be factored from 3x2 – 18

A. 3 must be factored from .

Step-by-step explanation:

We have been given an equation . We are asked to choose the correct step, which will convert our given equation in form .

To find the vertex of parabola we use formula , where b represents coefficient of x and a represents coefficient of .

So we can convert our given equation in vertex form of parabola by factoring out greatest common factor of first two terms of our given equation as:

Therefore, option A is the correct choice.

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

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