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Area of Bounded Regions · Question 14 of 115

Question 14

MediumOriginal question

What is the area of the region bounded by y=∣x∣y = \lvert x \rvert and y=2y = 2?

Options for question 14

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. They meet at x=±2x = \pm 2; the line lies above: ∫−22(2−∣x∣) dx=2∫02(2−x) dx\int_{-2}^{2} (2 - \lvert x \rvert)\,dx = 2\int_0^{2} (2 - x)\,dx.

  2. 2(4−2)=42(4 - 2) = 4 square units.

Worth noting

8 is the rectangle 4×24 \times 2; the region is the triangle above the V, half of it.

Concept
Area of a region bounded by lines
Typical time
90 s
Your time
—
The rule this testsRegions with lines
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Ten questions from Area of Bounded Regions, at your own pace.

Practise this chapter →

Ten questions from Area of Bounded Regions, at your own pace.