What is area x,5x,-x+4 ?

The answer to area x,5x,-x+4 is 8/3

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area x,5x,-x+4

area

x, 5 x, - x + 4

\frac{8}{3}

Decimal

2.66666 \dots

Solution steps

To find the intersection points solve

f_{i} (x) = f_{j} (x)

x = 5 x : x = 0

x = - x + 4 : x = 2

5 x = - x + 4 : x = \frac{2}{3}

= \int_{0}^{\frac{2}{3}} ∣ f_{1} (x) - f_{2} (x) ∣ d x + \int_{\frac{2}{3}}^{2} ∣ f_{1} (x) - f_{3} (x) ∣ d x

= \int_{0}^{\frac{2}{3}} ∣ x - 5 x ∣ d x + \int_{\frac{2}{3}}^{2} ∣ x - (- x + 4) ∣ d x

\int_{0}^{\frac{2}{3}} ∣ x - 5 x ∣ d x = \frac{8}{9}

\int_{\frac{2}{3}}^{2} ∣ x - (- x + 4) ∣ d x = \frac{16}{9}

= \frac{8}{9} + \frac{16}{9}

Simplify

= \frac{8}{3}

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