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How do you multiply $- (2 a + 3 b + 4 c)$ $-(2a + 3b + 4c)$ ?

1 Answer

Apr 20, 2018

$- 2 a - 3 b - 4 c$ $-2a-3b-4c$

Explanation:

$- (2 a + 3 b + 4 c) = (- 1) (2 a + 3 b + 4 c)$ $-(2a+3b+4c)=\color(red)((-1))(2a+3b+4c)$
$(- 1) (2 a) + (- 1) (3 b) + (- 1) (4 c)$ $\color(red)((-1))(2a)+\color(red)((-1))(3b)+\color(red)((-1))(4c)$
$- 2 a + (- 3 b) + (- 4 c) = - 2 a - 3 b - 4 c$ $-2a+(-3b)+(-4c)=-2a-3b-4c$

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