(3a - 2b - 5c)^2 expand this step by step
Answers
Answered by
4
Answer:
9a^2 + 4b^2 + 25c^2 - 12ab + 20bc - 30ca
Step-by-step explanation:
(3a - 2b - 5c )^2
using identity _ (a^2+b^2+c^2)=
a^2 + b^2 + c^2 + 2ab + 2bc + 2ca
= (3a)^2 + (-2b)^2 + (-5c)^2 + 2(3a)(-2b) + 2(-2b)(-5c) + 2(-5c)(3a)
= 9a^2 + 4b^2 + 25c^2 - 12ab + 20bc - 30ca
answer
Similar questions