Question

factarise the following
3a (square) - 75b (square)​

Answer 1

$3 {a}^{2} - 75 {b}^{2}$

$= 3( {a}^{2} - 25 {b}^{2} )$

$= 3( {a}^{2} - {(5b)}^{2} )$

By Using,

${a}^{2} - {b}^{2} = (a + b)(a - b)$

We get,

$= 3(a + 5b)(a - 5b)$