SOLUTION:
Step 1:
To multiply (x + 1) (x - 3)
Step 2:
[tex]\begin{gathered} (x\text{ + 1) }(x\text{ - 3)} \\ x\text{ }(x\text{ - 3) +1 (x - 3)} \\ x^2\text{ - 3x + x -3} \\ x^2\text{ - 2x - 3} \end{gathered}[/tex]CONCLUSION:
[tex](x+1)(x-3)=x^2\text{ -2x -3}[/tex]