Question

(5a + 4b -c) to the whole square​

Answer 1

Identity used Here ↓

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

(5a + 4b - c)²

[5a + 4b + -(c)]²

(5a)² + (4b)² + (-c)² + 2*5a*4b + 2*4b*-c + 2*5a*-c

25a² + 16b² + c² + 40ab - 8bc - 10ac