### Algebra: Variables

### Sum and product of variables

Product

The expression #3\times x \times y# is the \[3\times x \times y = 3 \cdot x \cdot y\] We can also omit the dot: \[3 \cdot x \cdot y = 3xy\] #3#, #x# and #y# are called the |

Sum

The expression #x+3y# is the The term #x# can be seen as the product #1\cdot x#. The term #3y# is the product #3\cdot y#. |

The terms of #9\cdot c-4\cdot d# are: \[9\cdot c \text{ and } \left(-4\right)\cdot d\]

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