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

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Answer 1 · 2015-06-25T08:01:55

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

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

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

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

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