Solve for 7v^2+2v-4=0

Question

I know I could use the quadratic equation but I want to know if what I got as answer is correct 

Answer 1

7v^2 + 2v - 4= 0

 

a=7

b=2

c=-4

 

 

v= (-b+- sqrt(b²-4ac))  /  2a

 

  = (-2+-(sqrt(2²-4(7)(-4)))/ 2(7)

 

  = (-2+-(sqrtr(4+ 112))/14

 

  = (-2+-(sqrt(116))/14

 

  = (-2+-(10.77))/14

 

v=( -2+10.77)/14   or v=(-2-10.77)/14

 

 =0.6264                or  v=-0.9121