Question
Multiply: $4a + 5b$ and $4a - 5b$
✓
Answer
Product of $4a + 5b$ and $4a - 5b$
$= 16a^2 - 25b^2$
$4a + 5b$
$\times 4a - 5b$
$16a^2 + 20ab$
$- 20ab - 25b^2$
$16a^2 - 25b^2$
$= 16a^2 - 25b^2$
$4a + 5b$
$\times 4a - 5b$
$16a^2 + 20ab$
$- 20ab - 25b^2$
$16a^2 - 25b^2$
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