Consider the function f(x)=3-4x^{2}, -4\le x\le 1. The absolute maximum value

guringpw

guringpw

Answered question

2021-12-08

Consider the function f(x)=34x2,4x1.
The absolute maximum value is
and this occurs at x=
The absolute minimum value is
and this occurs at x=

Answer & Explanation

Andrew Reyes

Andrew Reyes

Beginner2021-12-09Added 24 answers

Step 1
Given that
f(x)=34x2,4x1
Here endpoints of interval are -4 and 1
Step 2
Differentiate the function with respect to x
f(x)=ddx[f(x)]
=ddx(34x2)
=0-4(2x)
=-8x
Step 3
Equate f′(x) to zero and find the critical point.
f'(x)=0
-8x=0
x=0
Step 4
Absolute maximum and minimum occur at the critical point or at the endpoints.
Find the value of f(x) at the endpoints (x = -4, 1) and at the critical point (x = 0)
At x=-4, f(4)=34(4)2=61
At x=0, f(0)=34(0)2=3
At x=1, f(1)=34(1)2=1
Step 5
Function is maximum at x = 0. So, absolute maximum value is 3 and this occurs at x = 0.
Function is minimum at x = -4. So, absolute minimum value is -61 and this occurs at x = -4.

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