Final Answer
Step-by-step Solution
Problem to solve:
Specify the solving method
We could not solve this problem by using the method: Product of Binomials with Common Term
Multiply the single term $x-4$ by each term of the polynomial $\left(x+1\right)$
Multiply the single term $x$ by each term of the polynomial $\left(x-4\right)$
When multiplying two powers that have the same base ($x$), you can add the exponents
Combining like terms $-4x$ and $x$