Posted by Anonymous on Tuesday, January 3, 2012 at 3:08pm.
The coordinates of the point where the normal to the curve y= 1/3 x^3 + 1/2 x^2 + x at x=1 intersects the yaxis are what?

Calc  Reiny, Tuesday, January 3, 2012 at 3:21pm
dy/dx = x^2 + x + 1
at x=1 ,slope of tangent is 1+1+1 = 3
so slope of normal is 1/3
when x=1, y = 1/3 + 1/2 + 1 = 11/6
so equation of normal:
y = (1/3)x + b, at (1, 11/6)
11/6 = 1/3 + b
b = 3/2
y = (1/3)x + 13/6
for yintercept, let x = 0
y = 13/6
it cuts at (0,13/6)
check my arithmetic
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