Question

$64 b^{2} y^{2} - \frac{1}{81 b^{2}y^{2} }$

Answer 1

$\huge\underline{ \underline{ \bf{ { \blue{ so{ \pink{lu{ \purple{tion \: : = }}}}} }}}} </p><p></p><p>$

$\bf64b {}^{2} y {}^{2} - \frac{1}{81} b {}^{2} y {}^{2}$

$\bf(8by) {}^{2} -( \frac{1}{9by}) {}^{2}$

by using,

$\bf{ \boxed{ \fbox{a {}^{2} - b {}^{2} = (a + b)(a - b)}}}$

$( \bf8by - \frac{1}{9by} )(8by - \frac{1}{9by})$

Answer 2

⠀⠀⠀⠀⠀⠀⠀⠀$\huge\underline{ \underline{ \mathbb{ { \blue{ SO{ \pink{LU{ \purple{TION \: : = }}}}} }}}}$

$\bf(8by) {}^{2} -( \frac{1}{9by}) {}^{2}(8by)$

by using,

$\bf \green{ \boxed{ \fbox{a {}^{2} - b {}^{2} = (a + b)(a - b)}}} </p><p>$

$( \bf8by - \frac{1}{9by} )(8by - \frac{1}{9by})$