Q51 / 90 · JEE Main 2023 (10 Apr Shift 2) · Mathematics

If the area of the region x,y:x2-2≤y≤x is A, then 6A+162 is equal to ______________

Correct answer: 27

Solution

Given,

x2-2≤y & y≤x

Now on finding the intersection point we get, x,y≡1,1 & 2,2

Now plotting the curve of the above function we get,

Figure

Now from above diagram required bounded area will be,

A=∫12x-2-x2dx+∫22x-x2-2dx

⇒A=x22-2x+x3312+x22-x33+2x22

⇒A=1-22+223-12-2+13+2-83+4-1-223+22

⇒A=92-823

⇒6A=27-162

⇒  6A+162=27

Hence, the correct answer is 27.

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