A) 9
B) 6
C) 3
D) 12
Correct Answer: B
Solution :
\[4{{x}^{2}}=({{15}^{2}}-{{9}^{2}})\] \[\Rightarrow \]\[4{{x}^{2}}=(15+9)(15-9)\] \[\Rightarrow \]\[4{{x}^{2}}=24\times 6\] \[\Rightarrow \]\[{{x}^{2}}=\frac{24\times 6}{4}=6\times 6\] \[\therefore \] \[x=\sqrt{6\times 6}=6\]
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