If a^2+b^2+c^2=21, and a + b + c = 7, th...

If `a^2+b^2+c^2=21`, and a + b + c = 7, then (ab + bc + ca) is equal to :
यदि`a^2+b^2+c^2=21` है तथा a +b + c = 7 है, तो (ab + bc + ca) का मान क्या होगा ?

A

14

B

8

C

28

D

12

Text Solution

Verified by Experts

The correct Answer is:

A

Promotional Banner

Promotional Banner

Recommended Questions

If a^2+b^2+c^2=21, and a + b + c = 7, then (ab + bc + ca) is equal to ...
Text Solution
|
If a+b+c=4 and a^(2)+b^(2)+c^(2)+3(ab+bc+ac)=21 where a, b, c in R the...
Text Solution
|
यदि a,b,c in R तब सारणिक triangle|(a^(2)+b^(2)+c^(2),bc+ca+ab,bc+ca+a...
Text Solution
|
If a-(1//a) = b, b-(1//b) =c and c - (1//c) = a, then what is the valu...
Text Solution
|
If a^2+b^2+c^2=ab+bc+ac then the value of (a+c)/b is:- यदि a^2+b^2+c^2...
Text Solution
|
If ab + bc + ca = 8 and a^2+b^2+c^2=20 , then a possible value of 1/2 ...
Text Solution
|
If ab+bc+ca=8 and a+b+c=12 then (a^2+b^2+c^2) is equal to: यदि ab+b...
Text Solution
|
If a^2+b^2+c^2=21 , and a + b + c = 7, then (ab + bc + ca) is equal to...
Text Solution
|
If a + b + c = 13 and ab + bc + ca = 54 and a^3+b^3+c^3-3abc is equal ...
Text Solution
|