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You need to multiply each term of one factor to every term of the others.

For example, (a+b) (c+d)

Multiply a to c = ac
multiply a to d = ad
multiply b to c = bc 
multiply b to d = bd

So,   (a+b) (c+d)   =   ac + ad + bc + bd

Note that you may combine constants and similar terms.

Similar terms are those with the same variables raised to the same power.
Example: x² + x² = 2x²
2 5 2