Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.



Question

secondary 4 | A Maths
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
Tiffany
Tiffany

secondary 4 chevron_right A Maths chevron_right Singapore

Please help! (":

Date Posted: 1 month ago
Views: 39

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Eric Nicholas K
Eric Nicholas K's answer
5948 answers (Tutor Details)
1st
Recall that the value of dy/dx at a certain point represents the gradient of the TANGENT (not the gradient of the normal) to the curve at that point.

That said, recall that the normal to a curve is a line perpendicular to the tangent to the same curve at the tangential point.

For two perpendicular lines, the product of their gradients must equal to -1 (except for horizontal and vertical lines, though this side scenario is too easy to humans - horizontal lines and vertical lines are always perpendicular!).