Mark M. answered 02/10/21
Tutor
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Retired college math professor. Extensive tutoring experience.
Use the formula A2 - B2 = (A + B)(A - B)
49x2 - 81 = (7x)2 - (9)2 = (7x + 9)(7x - 9)
Charles T.
asked 02/10/2149x^2-81
Mark M. answered 02/10/21
Retired college math professor. Extensive tutoring experience.
Use the formula A2 - B2 = (A + B)(A - B)
49x2 - 81 = (7x)2 - (9)2 = (7x + 9)(7x - 9)
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