SOLUTION: find vertex with vertex formula. find where f is increasing and decreasing f(x)= -4/5^2

SOLUTION: find vertex with vertex formula. find where f is increasing and decreasing f(x)= -4/5^2 - 1/5x +1

Question 408258: find vertex with vertex formula. find where f is increasing and decreasing
f(x)= -4/5^2 - 1/5x +1
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

The vertex is found using the formula for (x,y):
(-b/2a,f(-b/2a))
find

=
=
=...so we have (-0.125,y)..now find

................ so the vertex is (-0.125,1.0125)

the intervals on which the function is increasing and the intervals on which the function is decreasing
Given the vertex of (-0.125,1.0125):
The function is increasing on:
(-∞,-0.125)
The function is decreasing on:
(-0.125,∞)

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