please answer class 8th maths
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Step-by-step explanation:
(x+7y)(7x-y)
=7x^2 +49xy -xy -7y^2
7x^2+48xy-7y^2
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Q. Find the product (x+7y)(7x-y)
Answer: 7x²+ 48xy - 7y²
Step-by-step explanation:
= x(7x-y) + 7y(7x-y)
= {(x × 7x) - (x × y)} + {(7y × 7x) - (7y × y)}
= 7x² - xy + 49yx - 7y²
= 7x²+ 48xy - 7y²
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