How do you find the sum of $(c-4)+(3c+9)$ ?

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Answer 1 · 2016-12-01T14:00:41

$4c + 5$

Step 1) Remove the parenthesis:

$c - 4 + 3c + 9$

Step 2) Rearrange to combine like terms:

$c + 3c - 4 + 9$

Step 3) Add like terms:

$(1c + 3c) + (-4 + 9)$

$(1 + 3)c + 5$

$4c + 5$

How do you find the sum of (c-4)+(3c+9)(c-4)+(3c+9)?