Question

Determine valor de x
2x^2=x+3+x+9

Answer 1

2x^2 = x + 3 + x + 9

2x^2 = 2x + 12

2x^2 - 2x - 12 = 0

a=2--b=-2--c=-12

Formula delta

D = b^2 - 4 a c

D = (-2)^2 - 4 (2) ( -12)

D = 4 - 8 (-12)

D = 4 + 96

D = 100

Formula da braskara

x = - b + , - \/ D
......__________
...............2a

x = - (-2) + , - \/ 100
.......____________
..................2(2)

x = 2 + , - 10
......_______
.............4

x' = 2 + 10
......._____
............4

x' = 12
.......__
.........4

x' = 3

>>>>>>>>>>>>>>>>>>>>>>>>>

x" = 2 - 10
....... ____
...........4

x"= -8
......___
........4

x" = -2