Question
Multiply : $(x - y)$ and $(3x + 5y)$
✓
Answer
$(x – y) × (3x + 5y) = x × (3x + 5y) – y × (3x + 5y)$
= $(x × 3x) + (x × 5y) – (y × 3x) – ( y × 5y) $
= $3x^{2} + 5xy – 3yx – 5y^{2}$ = $3x^{2} + 2xy – 5y^{2}$
= $(x × 3x) + (x × 5y) – (y × 3x) – ( y × 5y) $
= $3x^{2} + 5xy – 3yx – 5y^{2}$ = $3x^{2} + 2xy – 5y^{2}$
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