Question

81x2-49

Answer 1

you wanto factor it ?

Answer 2

\[a^{2}b^{2} - c^{2} = ( ab - c)(ab + c)\]

Answer 3

and u can write
\[81 = 9^{2}\]\[49 = 7^{2}\]
so..
\[81x^{2} - 49 = 9^{2}x^{2} -7^{2}\]

Answer 4

a^2-b^2=(a+b)(a-b)