Exams › JEE Advanced › Maths

Find the area (in square units) bounded by the parabola x² = 8y and the line x - 2y + 8 = 0.

1. 36
2. 72
3. 18
4. 9

Correct answer: 36

Solution

Intersection: x² - 4x - 32 = 0 => (x-8)(x+4) = 0 => x = -4 and x = 8. Area = integral₋₄⁸ [(x+8)/2 - x²/8] dx. Antiderivative: x²/4 + 4x - x³/24. At x=8: 16+32-512/24 = 48 - 64/3 = 80/3. At x=-4: 4-16+64/24 = -12+8/3 = -28/3. Area = 80/3 + 28/3 = 108/3 = 36.

Related JEE Advanced Maths questions

• What is the area enclosed by the curves y = 2 − |2 − x| and y = 3/|x|?
• If f(x) and g(x) are continuous functions over the interval a ≤ x ≤ b, and p(x) represents the greater of f(x) and g(x), while q(x) represents the lesser of f(x) and g(x), what is the expression for the area enclosed by the curves y = p(x), y = q(x), and the vertical lines x = a and x = b?
• The area enclosed by the curves y = sin x + cos x and y = |cos x − sin x| over the interval [0, π/2] is -
• Let f: [1/2, 1] → R (the set of all real numbers) be a positive, non-constant and differentiable function such that f'(x) < 2 f(x) and f(1/2) = 1. Then the value of ∫[1/2 to 1] f(x) dx lies in the interval -
• Let S = {(x, y) ∈ R × R: x ≥ 0, y ≥ 0, y² ≤ 4x, y² ≤ 12 - 2x and 3y + √8x ≤ 5√8}. If the area of the region S is α√2, then α is equal to -
• The area of the region enclosed by the curves y = |(x + 2)/(x - 2)| and y = |(x - 2)/(x + 2)| together with the x-axis equals 4 ln(a/e). Find the value of a.

⚔️ Practice JEE Advanced Maths free + battle 1v1 →