Question

expansion : (3a+4b+5c)²​

Answer 1

Given =》(3a+4b+5c)²

Using the identity

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca

Solution =》(3a+4b+5c)²

=(3a)²+(4b)²+(5c)²+2×3a×4b+2×4b×5c+2×5c×3a

=9a²+16b²+25c²+24ab+40bc+30ca

Answer 2

Answer:

The right answer is 9a²+16b²+25c²+24ab+40bc+30ac

=(3a)²+(4b)²+(5c)²+2×3a×4b+2×4b×5c+2×5c×3a

=9a²+16b²+25c²+24ab+40bc+30ac