please help solve, thank you

Calculus
Tutor: None Selected Time limit: 1 Day

Let f(

Oct 3rd, 2015

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Sep 22nd, 2015

f(x) = -2x^2 + 18x


a. find vertex and determine whether it is a max or minimum


b. find zeros


c. Graph


Thank you!

Sep 22nd, 2015

These are too many questions. How much will you pay?

Sep 22nd, 2015

f(x)=-2x2+18x

a. At vertex

  d(f(x))/dx=

  d(-2x2+18x)/dx=0

  -4x+18=0

  x=9/2

At x=9/2, y=40.5

So vertex is (9/2, 40.5)

At vertex d2(f(x))/dx2=-4 <0

Hence it is maximum

______________________________________________

b. Zeroes are f(x)=0

  -2x2+18x=0

  x(-2x+18)=0

  x=0 or -2x+18=0

Zeroes are x=0,9

_________________________________________________

c. 


Sep 22nd, 2015
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