posted by physics .
The electric potential in a certain region is V = a x2 + b x + c, where a = 15 V/m2, b = −13 V/m, and c = 67 V.
1)Determine the electric field at x = 4 m.
2)Determine the position where the electric field is zero.
Put given a,b,c,x values 1st problem is solved.2. To find 2nd put v= 0 and solve the quadratic equation.