Ask Singapore Homework?

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



Question

secondary 2 | Maths
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
Amanda
Amanda

secondary 2 chevron_right Maths chevron_right Singapore

Pls help thks!

Date Posted: 4 years ago
Views: 243

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
g
G's answer
1 answers (Tutor Details)
1st
Amanda
Amanda
4 years ago
Why do we use b^2 -4ac=0 to get the answer?
g
G
4 years ago
There are 3 types of roots for quadratic equation
i) Real and distinct roots
ii) Equal roots
iii) Unequal or unreal roots

For i), your quadratic equation has 2 distinct roots (or answers). Your b^2-4ac is more than 0
For ii), your quadratic equation has equal roots, meaning when you solve them, the answers are the same. So your b^2-4ac is equal to 0
For iii), your quadratic equation has no answers. I think it is not in your syllabus so I would avoid talking about that.
For more information you can read https://perfectmaths.files.wordpress.com/2011/07/discriminant-table.png
Eric Nicholas K
Eric Nicholas K
4 years ago
The b2 - 4ac thing is meant to be learnt in sec 3 only.