Final Answer
$x^2-3x-4$
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Step-by-step Solution
Problem to solve:
$\left(x+1\right)\left(x-4\right)$
Specify the solving method
We could not solve this problem by using the method: Product of Binomials with Common Term
1
Multiply the single term $x-4$ by each term of the polynomial $\left(x+1\right)$
$x\left(x-4\right)+x-4$
2
Multiply the single term $x$ by each term of the polynomial $\left(x-4\right)$
$x\cdot x-4x+x-4$
3
When multiplying two powers that have the same base ($x$), you can add the exponents
$x^2-4x+x-4$
4
Combining like terms $-4x$ and $x$
$x^2-3x-4$
Final Answer
$x^2-3x-4$