TCS
Company
Numerical Ability
Age Problem
If x = 3 + 1 and y = 3 - 1 , then the value of (x2 + y2) is:
3 - 1 3 + 1
Read Solution (Total 9)
-
- x^2=9+1+6
y^2=9+1-6
therefore x^2+y^2=20 - 10 years agoHelpfull: Yes(12) No(2)
- sorry it is addition then , 2(x^2+y^2)= 40
hence x^2+y^2 = 20.
- 10 years agoHelpfull: Yes(4) No(3)
- 20 is the answer i guess
- 10 years agoHelpfull: Yes(2) No(5)
- (x+y)^2-(x-y)^2 = 6^2-2^2
2(x^2+y^2)=32
hence x^2+y^2 =16. - 10 years agoHelpfull: Yes(2) No(12)
- x=3+1=4
y=3-1=2
x^2+y^2=4^2+2^2
=16+4
=20 - 10 years agoHelpfull: Yes(2) No(0)
- x^2 + Y^2 = (9+1+6)+(9+1-6)
= 16 + 4 =20
ans is 20.
- 10 years agoHelpfull: Yes(0) No(0)
- (x+y)^2+(x-y)^2/2=x2+y2
putting the value of x and y - 10 years agoHelpfull: Yes(0) No(0)
- (3+1)^2 + (3_1)^2 = 20
- 10 years agoHelpfull: Yes(0) No(0)
- (x+y)²+(x-y)² = x²+y²+2xy+x²+y²-2xy
= 2(x²+y²)
(6)²+(-2)² = 2(x²+y²)
Therefore x²+y² = (36+4)/2
= 18 + 2 - 10 years agoHelpfull: Yes(0) No(0)
TCS Other Question