How do you multiply $(4x+5) (x+1)$ ?

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Answer 1 · 2015-08-17T16:01:19

Use FOIL -- First, Outer, Inner, Last -- and add the results

F:
$4x*x=4x^2$
O:
$4x*1=4x$
I:
$5*x=5x$
L:
$5*1=5$

Now add:
$4x^2+4x+5x+5=4x^2+9x+5$

How do you multiply (4x+5) (x+1)(4x+5) (x+1)?