How do you multiply $(x + 3)(x + 4)$ ?

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Answer 1 · 2018-04-29T12:32:14

Use the distributive property.

One way is to set this up as a square matrix

     x       +      3

x $( x xx x) + (3 xx x)$

+

4 $(4 xx x) + ( 3 xx 4 )$

This gives $x^2 + 3 x + 4x + 12$ Adding the like terms gives

$x^2 + 7x + 12$

How do you multiply (x + 3)(x + 4)(x + 3)(x + 4)?