Q. Let g(x)=3x3+8.What is the absolute minimum value of g over the closed interval −2≤x≤2 ?Choose 1 answer:(A) −16(B) 16(C) 8(D) −8
Find Critical Points: To find the absolute minimum value of the function g(x)=3x3+8 on the interval [−2,2], we first need to find the critical points of g(x) within the interval. Critical points occur where the derivative g′(x) is zero or undefined.
Calculate Derivative: We calculate the derivative of g(x):g′(x)=dxd(3x3+8)=9x2.
Set Equal to Zero: Set the derivative equal to zero to find critical points:9x2=0.Solving for x gives us x=0 as the only critical point within the interval [−2,2].
Evaluate Function: Now we evaluate the function g(x) at the critical point and the endpoints of the interval to find the absolute minimum value.g(−2)=3(−2)3+8=3(−8)+8=−24+8=−16.g(0)=3(0)3+8=0+8=8.g(2)=3(2)3+8=3(8)+8=24+8=32.
Compare Values: Comparing the values of g(x) at the critical point and the endpoints, we find that the smallest value is g(−2)=−16.
Find Absolute Minimum: The absolute minimum value of the function g(x)=3x3+8 over the closed interval [−2,2] is −16.