Question

a(a+b+c)-b(a-b+c)+c(a+b-c) ??​

Answer 1

Answer:

a²+b²+c²+2ac

Step-by-step explanation:

a²+ab+ac-ab+b²-bc+ac+bc+c²

= a²+b²+c²+2ac

Answer 2

Answer:

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

Step-by-step explanation:

a ( a + b + c ) - b ( a - b - c ) + c ( a + b + c )

a² + ab + ac - ab - b² - bc - ac + bc +  c²

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