Question

ajudem ai

2x+3(3-2x)-2(1-x)=

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

???

Answer 1

2x + 3.(3 - 2x) - 2 (1 - x)

2x + 9 - 6x - 2 + 2x
2x + 2x - 6x + 9 - 2
= - 2x + 7

b)

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