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प्रश्न
Multiply the following:
(2x – 2y – 3), (x + y + 5)
उत्तर
We have,
(2x – 2y – 3) and (x + y + 5)
∴ (2x – 2y – 3)(x + y + 5) = 2x(x + y + 5) – 2y(x + y + 5) – 3(x + y + 5)
= 2x2 + 2xy + 10x – 2yx – 2y2 – 10y – 3x – 3y – 15
= 2x2 + 2xy – 2yx + 10x – 3x – 2y2 – 10y – 3y – 15 ...[Grouping like terms]
= 2x2 + 7x – 13y – 2y2 – 15
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