Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

If X greater than 0 and Y greater than 0 and X+Y=18 then the minimum value of XY is A. -1 B. 1 C. 2 D. -2

If X greater than 0 and Y greater than 0 and X+Y=18 then the minimum value of XY is
A.   -1
B.    1
C.    2
D.   -2

Grade:12

1 Answers

Arun
25763 Points
one year ago
Dear student
 
Let A = xy
A = x (18-x)
 
dA/dx = 18 -2x = 0
x = 9
 
Now d²A /dx² = -2 (maximum)
 
Hence maximum of A will exist when x = y = 9
 
Hence A = xy = 9*9 = 81

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free