(3k+4)(9k+5) the answer should be a polynomial standard form

Answer 1

(3k+4)(9k+5) can be found using the FOIL method.

F (first) multiply 3k and 9k together. 3k*9k=27k²

O (outsides) multiply 3k and 5 together. 3k*5=15k

I (insides) multiply 4 and 9k together. 4*9k=36k

L (last) multiply 4 and 5 together. 4*5=20

So now we have 27k² + 15k + 36k + 20.

Combine like terms. In this case the only like terms are 15k and 36k.

15k + 36k = 51k

The answer is 27k² +51k+20.