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Question

Which among the following function graph(s) are symmetrical about yaxis?

A
f1(x)=x(7x17x+1)
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B
f2(x)=x2+2
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C
f3(x)=1x,x0
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D
f4(x)=x3+3
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Solution

The correct option is B f2(x)=x2+2
If a graph of a function has to be symmetrical about yaxis, then it has to be an even function.
Now,
f1(x)=f1(x)f1(x) is even function
f2(x)=f2(x)f2(x) is even function
f3(x)=f3(x)f3(x) is odd function
f4(x)=x3+3f3(x) is neither even nor odd function.

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