How do you multiply $(a + b)(c + d)$ ?

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Answer 1 · 2016-10-10T16:58:30

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

To multiply $(a+b)(c+d)$ ,

let us first consider $(a+b)$ as single number

and applying distributive property.

$(a+b)(c+d)$

= $(a+b)xxc+(a+b)xxd$

Now on each of the two i.e. $(a+b)xxc$ and $(a+b)xxd$

can again be simplified using distributive property, as follows

$axxc+bxxc+axxd+bxxd$

= $ac+bc+ad+bd$

How do you multiply (a + b)(c + d)(a + b)(c + d)?