Question

Expand: (3a - 4b - 5c)²
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Answer 1

Answer:

the answer will be

9a²+16b²+25c²-180abc

Answer 2

Step-by-step explanation:-3a+4b-5c)²

It is in the form of-----

(a+b+c)² = a²+b²+c²+2ab+2bc+2ca

a=-3a , b=4b , c=-5c

=> (-3a)²+(4b)²+(-5c)²+2(-3a)(4b) +2(4b)(-5c)+2(-5c)(-3a)

=> 9a²+16b²+25c²-24ab-40bc+30ca