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Find the product of (3x + 7y)(3x − 7y). 9x2 − 42xy + 49y2 9x2 + 42xy + 49y2 9x2 − 49y2 9x2 + 49y2

Mathematics
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if you know the answer could you please explain it to me? I would like to know how..
9x2 − 49y2
9x2 − 49y2

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Other answers:

(a+b)(a-b)=a^2-b^2
(3x + 7y)(3x − 7y). First 3x times 3x = 9x2 Outside 3x times -7y = -21xy Inside 3x times 7y = 21xy Last 7y times -7y = -49y2 9 x2 - 21xy + 21xy - 49y2 = 9x2 - 49y2
thank you!(:
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