8. [-/1 Points] DETAILS LARCALCET7 13.6.017. MY NOTES Find the gradient of the function at the given point. Z = In(x2 - y) - 7, (3, 8) X Vz(3, 8) = Need Help? Read It Watch It Submit Answer 9. [-/1 Points] DETAILS LARCALCET7 13.6.026.MI. MY NOTES Use the gradient to find the directional derivative of the function at P in the direction of PQ. f( x, y) = 3x2 - y2 + 4, P(3, 9), Q(6, 4) Need Help? Read It Master It