Question

factorise 0.81b³-b







.​

Answer 1

• Since both terms are perfect squares, factor using the difference of squares formula,}
•  a2−b2=a+b)(a−b)a2-b2=(a+b)(a-b) 

where a=9ba=9b and b=10b=10.

0.01b(9b+10)(9b−10)

hope it helpful for you