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Since 7, -42, and 63 can be divided by 7, the problem can be written as:

7(x² - 6xy + 9y²) now you can factor the problem within the parentheses:

7(x - 3y)(x - 3y)

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Q: How do you solve this problem 7x squared-42xy plus 63y square and please show how you did it?
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