Finding Areas by Integration (HSC SSCE Mathematics Advanced): Quizzes

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Finding Areas by Integration
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What is the key difference between an area and a definite integral?

An area is always positive; an integral can be negative

What is the first step in the three-step method for finding areas by integration?

Draw a sketch showing intercepts and intersections

When a curve sits completely above the xx-axis, what is true about the definite integral?

It is positive and equals the area

How do you find the area when a curve lies completely below the xx-axis?

Take the absolute value of the integral

What must you do when a curve crosses the xx-axis to find the total area?

Split at x-intercepts and add absolute values

What is the defining property of an odd function f(x)f(x)?

f(x)=f(x)f(-x) = -f(x) for all xx in its domain

What type of symmetry do odd functions have graphically?

Rotational symmetry of 180° about the origin

How can symmetry of odd functions simplify area calculations?

Calculate one region's area and double it

In integration with respect to yy, what are the limits of integration?

yy-values rather than xx-values

When is it useful to integrate with respect to yy instead of xx?

When the region is easier to describe using yy

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