Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Determinants

Question:

Which of the following regions will represent the shaded area in the given figure?

Options:

$\left\{(x, y): 0 ≤ y ≤ x^2+2,0 ≤ y ≤ 2 x+2,0 ≤ x ≤ 3\right\}$

$\left\{(x, y): 0 ≤ y ≤ x^2+2, y ≥ 2 x+2, x ≤ 3\right\}$

$\left\{(x, y): y ≥ x^2+2, x ≤ 2, x ≥ 0\right\}$

$\left\{(x, y): y ≥ x^2+2, x ≥ 0, x ≥ 3\right\}$

Correct Answer:

$\left\{(x, y): 0 ≤ y ≤ x^2+2,0 ≤ y ≤ 2 x+2,0 ≤ x ≤ 3\right\}$

Explanation:

from the given figure

equation of parabola is

$y = x^2 + 2$

of straight line passing (0, 2) and (2, 6)

$\frac{y-2}{x-0} = \frac{6-2}{2-0}$

so y = 2x + 2

⇒  0 ≤ x ≤ 2

$0 ≤ y ≤ x^2+2$  (under the parabola)

and $0 ≤ y ≤ 2x+2$

⇒ Region → $\left\{(x, y): 0 ≤ y ≤ x^2+2,0 ≤ y ≤ 2 x+2,0 ≤ x ≤ 3\right\}$