(4b+5c)(4c+3b)=

2 answers

16bc+12b(squared)+20c(squared)+15bc

12b(squared)+ 20c (squared)+ 31bc
(4b+5c)(4c+3b) = (4b+5c)(3b+4c)

4b + 5c
3b + 4c

Multiplying

16bc+20C^2
12b^2+15bc

= 12b^2+31bc+20c^2

I hope this makes the process clearer. Thanks for asking.