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As you may be noticing, mathematics is its own language. And in mathematics, we like to be as clear as possible to eliminate any confusion. However, the way we write the symbol to show multiplication can be confusing in some contexts, especially when we start using variables. Therefore, we have more than one way to show multiplication. Watch this video, which highlights some common ways to write multiplication in algebra. It also shows examples of how to substitute values in algebraic expressions.
Source: Khan Academy, https://youtu.be/vDaIKB19TvY This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.