Question

(a-3b)^(2) multiply i need work shown step by step

Answer 1

(x+y)^2=x^2+2xy+y^2

Answer 2

and
(x-y)^2=x^2-2xy+y^2

Answer 3

in you case you would have:
(a-3b)^2=a^2-2*3ab+9b^2

Answer 4

or a^2-6ab+9b^2