Fatu tried to subtract two polynomials. Her work is shown below:
$\begin{align}
&\phantom{=}(2p^2-3p-7)-(3p^2+p-5)
\\\\
&=2p^2-3p-7-3p^2-p+5&\text{Step }1
\\\\
&=(2-3)p^2+(-3-1)p+(-7+5)&\text{Step }2
\\\\
&=p^2-2p+2&\text{Step }3
\end{align}$
**At which step did Fatu make an error, if at all?**
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