Math, asked by putipriya, 3 days ago

please solve both of them
I'll mark as brainliest

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Answered by perfectok10

1

Answer:

a) a² - 4ab - 21b²

b) 14x²y² + 7x²y - 2xy² - xy

Step-by-step explanation:

a) (a + 3b) (a - 7b) = a² - 7ab + 3ab -21b²

= a² - 4ab - 21b²

b) (7xy - y) (2xy + x) = 14x²y² + 7x²y - 2xy² - xy

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