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

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Answer 1 · 2015-06-06T21:50:02

You can use FOIL:

First + Outside + Inside + Last

$(x+3)(x+4) = x*x + x*4 + 3*x + 3*4$

$=x^2+4x+3x+12$

$=x^2 + (4+3)x+12$

$=x^2+7x+12$

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