Question

find max or min value of function tell whether this value is a max or min.
f(x)=-2x^2-4x+3

Answer 1

max is at x=-1
use your calculator to graph

Answer 2

x = -b/2a
a = -2
b = -4
c = 3
x = 4/-4 = -1
Plug in (-1) for x and you get 5

Max at (-1,5) it is a max because -2x^2 is negative.

Answer 3

f(x)=-3(x+3)^2-7
same rules