A) 21
B) - 21
C) 23
D) - 23
Correct Answer: D
Solution :
\[2{{g}_{2}}({{g}_{1}}-{{g}_{2}})\,+2{{f}_{2}}({{f}_{1}}-{{f}_{2}})={{c}_{1}}-{{c}_{2}}\] \[2(1)\,\,(3-1)+2(-3)\,\,(-1+3)=k+15\] \[4-12=k+15\] or \[-8=k+15\,\Rightarrow \,k=-23\].You need to login to perform this action.
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