Question
Add:
$3a(2b + 5c), 3c(2a + 2b)$
$3a(2b + 5c), 3c(2a + 2b)$
✓
Answer
$3a(2b + 5c) + 3c(2a + 2b)$
$= (6ab + 15ac) + (6ac + 6bc)$
$= 6ab + 15ac + 6ac + 6bc$
$= 6ab + 21ac + 6bc$
$= (6ab + 15ac) + (6ac + 6bc)$
$= 6ab + 15ac + 6ac + 6bc$
$= 6ab + 21ac + 6bc$
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