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35 votes
35 votes
If f(x) = x2 + 2, for what value of x will f(x) = 11A 1 1 B) 2 C) 3 D) 4

User Tirenweb
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1 Answer

21 votes
21 votes

\begin{gathered} \text{The function is,} \\ f(x)=x^2+2 \\ \text{The given data is}\Rightarrow f(x)=11 \\ So,\text{ } \\ \text{Substitute the value of f(11) in the function as follows:} \\ 11=x^2+2 \\ x^2=11-2 \\ x=\sqrt[]{9} \\ x=3 \\ So,\text{ the option (C) is correct.} \end{gathered}

User Eid
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