Question

(3a-b)(3a+b)(9a^2+b^2)

Answer 1

Answer:

81a^4 - b^4

Step-by-step explanation:

(3a-b)(3a+b) (9a^2+b^2)          { (a+b)(a-b) = a^2-b^2}

= [(3a)^2 - (b)^2] * (9a^2+b^2)  

= (9a^2-b^2) * (9a^2+b^2)  

= (9a^2)^2 - (b^2)^2

= 81a^4 - b^4