Question

como eu resolvo? 7x-(-1+2x) =-1+2x+3

Answer 1

7x-1+2x-1-2x+3=0
(7x-2x) -(1-3)=0
7x-4=0
7x=4
x=4


ou

7x-4=0

Delta = b^2 - 4.a.c = 7^2- 4.0.-4
49
raiz de 49 = 7

b/c = 4/7