Given the following statements about a function f
  • $\mathrm { f } ^ { \prime \prime } ( x ) = a$ for all $x$
  • $\mathrm { f } ( 0 ) = 1 , \mathrm { f } ( 1 ) = 2$
  • $\int _ { 0 } ^ { 1 } \mathrm { f } ( x ) \mathrm { d } x = 1$

find the value of $a$.
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Given the following statements about a function f

\begin{itemize}
  \item $\mathrm { f } ^ { \prime \prime } ( x ) = a$ for all $x$
  \item $\mathrm { f } ( 0 ) = 1 , \mathrm { f } ( 1 ) = 2$
  \item $\int _ { 0 } ^ { 1 } \mathrm { f } ( x ) \mathrm { d } x = 1$
\end{itemize}

find the value of $a$.