# Math Help - expand and simplify

1. ## expand and simplify

(2x^2+9x+10)(x+4)

2. Originally Posted by william
(2x^2+9x+10)(x+4)
Start it out this way:

$(x+4)(2x^2+9x+10)=x(2x^2+9x+10)+4(2x^2+9x+10)=$

3. Originally Posted by william
(2x^2+9x+10)(x+4)
Hmmm there is a rule you gotta learn to know how to expand... but i can't remember it

Here are my two cents:
$({\color{red}2x^2}+{\color[rgb]{.5,0,1}9x}+{\color{blue}10})(x+4)={\color{red}2x^ 2}(x+4)+{\color[rgb]{.5,0,1}9x}(x+4)+{\color{blue}10}(x+4)$

${\color{red}2x^2}(x+4)={\color{red}2x^2}*x+{\color {red}2x^2}*4$
${\color[rgb]{.5,0,1}9x}(x+4)={\color[rgb]{.5,0,1}9x}*x+{\color[rgb]{.5,0,1}9x}*4$
${\color{blue}10}(x+4)={\color{blue}10}*x+{\color{b lue}10}*4$

Do you get it ?

4. Originally Posted by masters
Start it out this way:

$(x+4)(2x^2+9x+10)=x(2x^2+9x+10)+4(2x^2+9x+10)=$
So, it = 2x^3 +17x^2+46x+40?

5. Originally Posted by william
So, it = 2x^3 +17x^2+46x+40?
Nice Job!