Question
Multiply $: (x + 9y)$ and $(x – 5y)$
✓
Answer
$(x + 9y) \times (x − 5y)$
$= x \times (x + 9y) − 5y (x + 9y)$
$= x^2 + 9xy − 5xy − 45y^2$
$= x^2 + 4xy − 45y^2$
$= x \times (x + 9y) − 5y (x + 9y)$
$= x^2 + 9xy − 5xy − 45y^2$
$= x^2 + 4xy − 45y^2$
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