How do you simplify $-21(a+2b)+14a-9b$ ?

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Answer 1 · 2016-01-27T03:29:43

$-7a-51b$

$-21(a+2b)+14a-9b$

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$-21a-42b+14a-9b$

Add like terms

$-21a+14a-42b-9b$
$-7a-51b$

:D

Answer 2 · 2016-01-27T03:32:42

$-(7a+51b)$

$-21(a+2b)+14a-9b$

Mutliply $a$ and $b$ by $-21$ :
$-21a - 42b + 14a - 9b$

Reorganize and operate:
$14a-21a-42b-9b$

$-7a-51b$

Optional, common factor $-1$ :
$-(7a+51b)$

How do you simplify -21(a+2b)+14a-9b-21(a+2b)+14a-9b?