Given f(x)=x^4-7x^3+6x^2+8x+9
a) determine the x- and y-coordinates of the lowest point on the graph.
b) size the x-window from [-10,10]. find the highest and lowest values of f(x) over the interval -10≤x≤10
c) find the highest and lowest values of f(x) if -2≤x≤6

The workings to the answers are in the attachments below. Open them up in a new window to see them in full.

Lowest Point On The Graph:

(4.480878208, -61.32441280)

Highest Point On The Graph:

(1.155422854, 17.23818241)

2nd Lowest Point On The Graph:

(-0.3863010618, 7.23076164)

You can find the area of a rectangle by multiplying the length and height. so multiply 1/2*7/4(which is the simpler version of 1 3/4) and you get 7/8 as your answer.

The linear equation is: y=ax+b