A few days ago
How would I factor 4x^2-81?
Please explain.
P.S. Know any good FREE homework help websites?
Top 3 Answers
A few days ago
Favorite Answer
difference of perfect square
a^2 – b^2 = (a + b) (a – b)
2^2 x^2 – 9^2
(2x)^2 – 9^2
(2x – 9) (2x + 9)
0
A few days ago
4x^2-81
=(2x + 9)(2x – 9)
0
A few days ago
It’s a special case: the difference of two squares.
a^2-b^2 = (a+b)(a-b)
1
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