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If 9a^2+4b^2+c^2+21= 4(3a + b - 2c), the...

If `9a^2+4b^2+c^2+21= 4(3a + b - 2c)`, then the value of (9a + 4b - c) is :
यदि`9a^2+4b^2+c^2+21= 4(3a + b - 2c)`, है, तो (9a + 4b - c) का मान क्या होगा ?

A

2

B

16

C

6

D

12

Text Solution

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The correct Answer is:
D
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MOTHERS-ALGEBRA -MULTIPLE CHOICE QUESTION
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  13. If a + b + c = 13 and ab + bc + ca = 54, then a^(3) + b^(3) + c^(3) - ...

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  14. If x + (1)/(x) = sqrt(5), then x^(3) + (1)/(x^(3)) is equal to :

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