A) 39
B) 24
C) 18
D) 36
Correct Answer: C
Solution :
We have \[4{{l}^{2}}+9{{m}^{2}}+2lm-9Fm\] \[=4{{(-1)}^{2}}+9{{(2)}^{2}}+2(-1)\,(2)-9{{(-1)}^{2}}(2)\] \[=4+36-4-18=40-22=18\]You need to login to perform this action.
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