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

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Global Maximum and Minimum
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Global max condition for f(a)f(a)

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

Global min condition for f(a)f(a)

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

Scope: local vs global extrema

Local: small neighbourhood; Global: entire domain

When can function have multiple global minima?

When multiple points share exactly equal lowest values

3 types of critical points to check for global extrema

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

Turning points occur where?

f′(x)=0f'(x) = 0

Why check endpoints on restricted domains?

Endpoints can be global extrema even if not turning points

When might global max not exist?

If highest value excluded from domain or extends to infinity

What makes parabola concave-down?

Negative coefficient of x2x^2 term (opens downward)

Axis of symmetry for parabola with 2 x-intercepts

Halfway between the two x-intercepts

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