Well I got this question:
Differentiate from first principals (i did it)
Find the equation of the normal to the curve at point where x = 3.
So first I found y.
That means we got
Then I subbed 3 into
to get the gradient of the tangent. Answer is
Since the normal and tangent are perpendicular the formula is
So that makes
Then I subbed it into
<=== you used the wrong sign in the bracket
Finally I get
but
for some reason <=== maybe they believe that 27² = 729
the answers in the book says it's different
Did I do anything wrong?
Also, I need help with another question:
If
find the derivative and find the values of y when
How would I go about starting this one?