y derivative of the fourth (4th) order minus 4y derivative of the third (3rd) order plus 14y two strokes of the second (2nd) order minus 20y stroke first (1st) order plus 25y equally 0
y derivative of the fourth (4th) order minus 4y derivative of the third (3rd) order plus 14y two strokes of the second (2nd) order minus 2 zero y stroke first (1st) order plus 25y equally 0