Question

Use the Binomial Theorem complete the binomial expansion.

(3x + 5)3 = 27x3 + 135x2 + __________

Answer 1

is that all in one O.O

Answer 2

What do you mean? Yeah, it's one binomial. I need to complete it but I'm confused.

Answer 3

(a + b)^3 = a^3 + b^3 + 3*a*b*(a + b)

Answer 4

can you solve it?

Answer 5

I'm still confused, sorry. What do I insert in (a) and (b)? @stefancipe

Answer 6

you have (3x+5)^3 , so a = 3x, and b= 5

Answer 7

ah okay i'll try it out

Answer 8

is it 225x?

Answer 9

i already solved it, so post solution here so i can check it :)

Answer 10

yes, but you're missing one small part :) 5^3

Answer 11

oh, okay!!! i get it, i get it. thank you so much! :)

Answer 12

no problem :)