How do you multiply $3x(x+9)$ ?

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Answer 1 · 2015-06-25T08:01:55

$= color(green)(3x^2 + 27x$

$color(green)( 3x)(x+9)$

Here $color(green)(3x)$ needs to be multiplied with each term within brackets:

$= color(green)(3x) . (x) + color(green)(3x) . (9)$
$= color(green)(3x^2 + 27x$

How do you multiply 3x(x+9)3x(x+9)?