Question

Find the square of 2a-4b+5c​​.​

Answer 1

Answer:

The answer is...

Step-by-step explanation:

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

here, a = 2a , b = -4b , c = 5c

• (2a - 4b + 5c)² = (2a)² + (-4b)² + (5c)² + 2 × 2a × -4b + 2 × -4b × 5c + 2 × 5c × 2a

• = 4a² + 16b² + 25c² - 16ab - 40bc + 20ac