How do you simplify $–2(a + 3b) + 4(2a – 3b)$ ?

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Answer 1 · 2015-06-11T08:17:45

$=color(red)( 6a - 18b$

$–2(a+3b) = color(blue)(-2a -6b$

$4(2a–3b) =color(red)( 8a -12b$

Combining:
$=color(blue)(-2a -6b + color(red)( 8a -12b$

Grouping like terms :
$= (-2a + 8a) + (-6b - 12b)$

$=color(red)( 6a - 18b$

How do you simplify –2(a + 3b) + 4(2a – 3b)–2(a + 3b) + 4(2a – 3b)?