The Area of a Region Between Two Curves (VCE SSCE Mathematical Methods): Quizzes

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The Area of a Region Between Two Curves
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What is the key idea for finding area between two curves?

Subtract lower curve area from upper

If f(x)g(x)f(x) \geq g(x) on [a,b][a,b], which formula gives the area?

ab[f(x)g(x)]dx\int_a^b [f(x) - g(x)] \, dx

What must you do when curves cross within the interval?

Split into intervals & switch order

To find where y=x2y = x^2 and y=2xy = 2x intersect, solve:

x2=2xx^2 = 2x

What is the area between y=x2y = x^2 and y=2xy = 2x from x=0x = 0 to x=2x = 2?

43\frac{4}{3}

Area of y=4x2y = 4 - x^2 and y=x2+1y = x^2 + 1 from x=1x = -1 to x=1x = 1 is:

143\frac{14}{3}

For f(x)=x3f(x) = x^3 and g(x)=xg(x) = x, between x=0x = 0 and x=1x = 1, which is on top?

g(x)=xg(x) = x is above

Total area between f(x)=x3f(x) = x^3 and g(x)=xg(x) = x from x=1x = -1 to x=1x = 1 is:

12\frac{1}{2}

Where do sinx\sin x and cosx\cos x intersect in [0,2π][0, 2\pi]?

x=π4x = \frac{\pi}{4} and x=5π4x = \frac{5\pi}{4}

What is the crucial first step when finding area between curves?

Find where curves intersect

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