Question

Expand ( 3a -7b-c)²​

Answer 1

Answer:

To expand

(3a - 7b - c)²

It can be expanded using algebraic identity

(a + b + c)² = a²+ b²+ c² + 2ab + 2bc + 2ac

where,

a = 3a

b = (-7b)

c = ( -c)

So,

(3a +(-7b)+(-c)² = (3a)² + (-7b)² + (-c)² + 2(3a)(-7b) + 2(-7b)(-c) + 2(3a)(-c)

= 9a² + 49b² + c² - 42ab + 14bc - 6ac

is the answer