Explanation
Given
[tex]P^3\cdot P^4[/tex]
This can be written without exponents as follows
[tex]\begin{gathered} P^3\cdot P^4=(P\times P\times P)\cdot(P\times P\times P\times P) \\ P^3\cdot P^4=P\times P\times P\times P\times P\times P\times P \end{gathered}[/tex]
The last part of the question is in exponent form, that is,
From the rule of indices,
[tex]\begin{gathered} P^3\cdot P^4=P^{3+4} \\ P^3\cdot P^4=P^7 \end{gathered}[/tex]
