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Mathematics 15 Online
OpenStudy (anonymous):

whats a factor of 4a^2-9b^2?

OpenStudy (anonymous):

what about 2a+3b?

hero (hero):

(2a + 3b)(2a - 3b)

OpenStudy (anonymous):

Why does the sign change to positive?

hero (hero):

because, difference of squares says... a^2 - b^2 = (a+b)(a-b)

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