Global Maximum and Minimum (HSC SSCE Mathematics Advanced): Quizzes

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Global Maximum and Minimum
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What condition defines a global maximum at point A(a,f(a))A(a, f(a))?

f(x)≤f(a)f(x) \leq f(a) for all xx in domain

What condition defines a global minimum at point A(a,f(a))A(a, f(a))?

f(x)≥f(a)f(x) \geq f(a) for all xx in domain

What is the key difference between local and global extrema?

Scope: local is neighbourhood, global is entire domain

When does a function have no global minimum?

When curve continues infinitely downward

Can two points both be global minima simultaneously?

Yes, if they have exactly equal function values

What are the three types of critical points to check for global extrema?

Turning points, boundaries, f′(x)f'(x) discontinuities

At what points do turning points occur?

Where f′(x)=0f'(x) = 0

For f(x)=4x−x2f(x) = 4x - x^2 on [0,4][0, 4], what is the absolute maximum value?

4 at x=2x = 2

For f(x)=x3−6x2+9x−4f(x) = x^3 - 6x^2 + 9x - 4 on [12,5][\frac{1}{2}, 5], where is the global maximum?

16 at x=5x = 5 (boundary point)

When must you evaluate the function at endpoints?

When domain is restricted to closed interval

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