A) 22
B) 27
C) 24
D) 36
Correct Answer: A
Solution :
Expression \[={{x}^{2}}+2{{y}^{2}}+4x=9+{{y}^{2}}+4x\] \[=9+9-{{x}^{2}}+4x=18-[{{x}^{2}}-4x]=18-[{{(x-)}^{2}}-4]\]\[=22-{{(x-2)}^{2}}\] \[\therefore \]Maximum value = 22You need to login to perform this action.
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