find the product of (x+7y) and (x-7y)
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Answer:
The answer is 7x² + 48xy - 7y².
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(x+7y) (x-7y)
......using (a+b) (a-b) = a²-b²
(x)² - (7y)²
x² - 49y²
Alternate method....
(x+7y) (x-7y)
.... Multiply by opening brackets
x² - 7xy + 7xy - 49y²
....... - 7xy and + 7xy gets cancelled because of - and + sign
x² - 49y²
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