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Question

If f(x)=√x2+6x+9, then f '(x) is equal to

A
1 for x>3
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B
1for x<3
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C
1 for all xR
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D
0 for x=3
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Solution

The correct option is B 1for x<3
f(x)=x2+6x+9=(x+3|Function is not differentiable at x=3.f(x)=((x+3), if x<3(x+3), if x>3f'(x)=(1, if x<31, if x>3

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