Question

(3ab-1)^2 pls tell me ​

Answer 1

$( {3ab - 1)}^{2} \\ \\ = ( {3ab)}^{2} - 2.3ab.1 + ( {1)}^{2} \\ \\ = 9 {a}^{2} {b}^{2} - 6ab + 1$

I hope this helps you.