Question

factorise (3x-5y)^2 -2(3x-5y)-15​

Answer 1

Step-by-step explanation:

Let (3x-5y) be z

So the above expression becomes

${z}^{2} - 2z - 15 = > {z}^{2} - 5z + 3z - 15$

$= > z(z - 5) + 3(z - 5) = >$

$(z + 3)(z - 5)$

Substitute z by (3x-5y) so the expression can be factorised as (3x-5y+3)(3x-5y-5). Hope it helps you.