Question

$\bold{factrise each of the following}$​

Answer 1

$\huge{\mathcal{\blue{\underline{Answer}}}}$

$= m {}^{4} - 18m {}^{2} n {}^{2} + 81n {}^{4} \\ = (m {}^{2} ) {}^{2} - 2(m {}^{2} )(9n {}^{2} ) + (9n {}^{2} ) {}^{2} \\ = (m {}^{2} - 9n {}^{2} )$