Question
Multiply $: 3a + 4b − 5c$ and $3a$
✓
Answer
$(3a + 4b − 5c) \times 3a$
$= (3a \times 3a) + (4b \times 3a) − (5c \times 3a)$
$= 9a^2+ 12ab − 15ac$
$= (3a \times 3a) + (4b \times 3a) − (5c \times 3a)$
$= 9a^2+ 12ab − 15ac$
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