Question

Sejam r e s as raízes da equação do 2º grau x²– 7x + 1 = 0.

Answer 1

X^2 - 7X + 1 = 0
a = 1
b = - 7
c = 1

Formula delta
D = b^2 - 4 * a * c
D = (-7)^2 - 4 (1) (1)
D = 49 - 4
D = 45

Formula de braskara
X = - b + ; - \|D
.......________
...............2*a


X = - (-7) + ; - \|45
.......___________
..................2*(1)


X = 7 + ; - \| 9* 5
......._________
................2


X = 7 + ; - 3*\|5
......._________
................2


X1 = 7 + 3*\|5
........_______
...............2


X1 = 7 + ( 3 * 2,24 )
.........___________
..................... 2


X1 = 7 + 6,72
........_______
................2


X1 = 13,72
.........____
.............2


X1 = 6,86.......r



X2 = 7 - 3*\|5
........._______
.................2


X2 = 7 - ( 3 * 2,24 ).
.........___________
......................2


X2 = 7 - 6,72
.........______
................2


X2 = 0,14
.........____
.............2


X2 = 0,07.....s