Factor the equation 81x^2-16y^2
\(81x^2-16y^2\\\\= (9x)^{2} - (4x)^{2}\\\\Using\ the\ formula\ a^{2} - b^{2} = (a-b )(a+b) \\\\=\boxed{(9x - 4) ( 9x + 4)\ Answer}\)
When factored, the exression is (9x + 4y) (9x - 4y)
