Help on two questions..

Question

destinyyyy · Answer

attachment

superdavesuper · Answer

the easiest way to check for maximum or minimum is probably by plotting it out. u can do it on a graphing calculator or online at wolfram and other sites.

destinyyyy · Answer

I dont really know how to use my graphing calculator (ti-84) and I cant use websites like that when I have to take the test later on.

amistre64 · Answer

what does a quadratic usually look like?

superdavesuper · Answer

http://www.wolframalpha.com/input/?i=f%28x%29%3D3x%5E2-24x-7 oh okay....the hard way then....

destinyyyy · Answer

What? @amistre64 

Okay :/ @superdavesuper

destinyyyy · Answer

Its been a little since ive done this type of problem so I just need a little guidance.

superdavesuper · Answer

since the Q ask about where the max/min occurs, u may as well go thro the calculation.  it will require differentiation. do u know how to get f'(x)=?

destinyyyy · Answer

What?

destinyyyy · Answer

@jim_thompson5910 @Nnesha @phi

tkhunny · Answer

Since we don't get to graph, learn to "complete the square".  This will guide you to all that is asked.

jim_thompson5910 · Answer

The leading term is 3x^2. The coefficient for this term is 3. This is called the leading coefficient.

Since the leading coefficient is positive, this means that the parabola will open upward like this

|dw:1446156941817:dw|

so we see that we will have a min value (not a max value) at the vertex