How do you combine $(5 a + 7 b + 9 c) - (5 a + b + 2 c)$ $(5a + 7b + 9c) - (5a + b + 2c)$ ?

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Answer 1 · 2015-07-23T12:03:10

$= 6 b + 7 c$ $=color(blue)(6b+7c$

$5 a + 7 b + 9 c - 5 a - b - 2 c$ $5a+7b+9c−5a - b - 2c$

Grouping like terms

$(5 a - 5 a) + (7 b - b) + (9 c - 2 c)$ $(5a - 5a) +(7b - b) + (9c - 2c)$

$= 6 b + 7 c$ $=color(blue)(6b+7c$

How do you combine (5a+7b+9c)−(5a+b+2c)(5a + 7b + 9c) - (5a + b + 2c)?