Question 686433
3x²+8x=11 --> 3x²+8x-11=0 *We equal the equation to zero. Now its a second grade
equation
   
Applying the second grade solving formula: 

{{{x = (-8 +- sqrt( 64 - 4*3*(-3) ))/(2*3) }}}  

x1 = -8 + 6 / 6 = -1/3
x2 = -8 - 6 / 6 = -7/3