Question

calculate..............................

Answer 1

E=dV/dr

Hence, E= 8x + 6y - 18z

= 24 + 24 -90

= - 42 V/m

Answer 2

v = 4x^2 +3y^2-9z^2


E=
$- ( \frac{dv}{dx} )$
dv/dx= -(8x+6y-18z) at (3,4,5)


E=42