Final answer to the problem
Step-by-step Solution
How should I solve this problem?
- Metodo FOIL
- Prodotto di binomi con termine comune
- Fattore
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We can multiply the polynomials $\left(x+1\right)\left(x-4\right)$ by using the FOIL method. The acronym F O I L stands for multiplying the terms in each bracket in the following order: First by First ($F\times F$), Outer by Outer ($O\times O$), Inner by Inner ($I\times I$), Last by Last ($L\times L$)
Then, combine the four terms in a sum
Substitute the values of the products
Apply the formula: $ab$$=ab$, where $ab=1\cdot -4$, $a=1$ and $b=-4$
Apply the formula: $1x$$=x$
Combining like terms $-4x$ and $x$
Apply the formula: $x\cdot x$$=x^2$