A-Level Maths: B5-18 [Inequalities: Tricky Example of a Discriminant Inequality]

[joshuachu]

Hey Jack, just wondering what calculator do you use that has a polynomial solver built into it? And isit compatible with the new A-level spec?

[simonselkirk]

Jack, if a question like this is included in the exam do we have to show our working for solving the cubic or can we use the polynomial solver as in this video? Once again, many thanks for all your hard work!

[shelvi]

Hi, I am slightly confused as to how I can access the polynomial solver on my calculator (Casio Classwiz fx-991EX)? Can you please let me know how to get it on my calculator? Thank you :)

[umairameen]

Hi,
I am struggling with the last part of the question, when you used the calculator. My answer on the calculator keeps -3<x<-2, 1<x
I don't understand how you have (k-1) (k+2) (k+3)>0
Please can you help me with this part?
Thanks

[slopherones]

watching this as a year 11 - a level maths isn't as bad as I thought ngl