Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 3 | A Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Just wanted to clarify for the expression to be more than 0, which is positive, it is a must for the discriminant < 0 and a > 0 so that the graph lies completely above the x-axis with no x-intercept right?
Date Posted: 1 year ago
Views: 163
yes, that is correct
The underlying idea is what you mentioned - the fact that the expression is always greater than zero implies that its graph is entirely above the x-axis.
The "a > 0" is necessary because only "smiley face" curves are capable of being "always positive". No "sad face" curves can be "always positive".
The "a > 0" is necessary because only "smiley face" curves are capable of being "always positive". No "sad face" curves can be "always positive".
I'll assume that you know how to proceed from there on. This is probably either your revision for Sec 3 topics or you are starting ahead as a Sec 2 student.
I see thank you
See 1 Answer
-
360 Tutoring Program