A-Level Edexcel C3 January 2007 Q2(b) : ExamSolutions

PREDICTIVE GRADES PLATFORM

☑️ Accurate grade predictions
☑️ Personalised resources and tuition
☑️ Guaranteed results or get your money back

SIGN UP FOR A 7-DAY FREE TRIAL, THEN 20% OFF.

ONLINE COURSES AT:

[ExamSolutions_Maths]

@YouBenTV That's ok - Keep up the revision.

[YouBenTV]

thanks for all of your uploads, it is very helpful to have someone go through the question for you.
my exam is on monday, i think you will help me get a B :)

[marzto]

Can you put it into root of b^2-4ac, see that it's negative and so does cross the X axis, shove an x value in the original equation to get a positive Y and thus showing the function range is always > 0.
Can you please tell me if this would be okay? I want to know all the tools I can draw upon for this exam.
Thanks, and thanks for these videos! So helpful!

[ahmedswagb]

Where did you substitute the x value to get 3/4 because on substituting in f(x) I got 7/4

and on subing it into dy/dx i got 0

A bit confused can u help me please

[fasad]

Do we always have to complete the square or is there any other way? Would the quadratic formula work?

[jamieshelley]

thx for answer p3 in this one, sort off as well , gotta get that one mark :D .. me thinks the exam board were looking to add some pointless marks here

[ashleigh]

wowwww you just made my life so much easier :)

[marzto]

@marzto Sorry, does NOT cross the X-axis, does that suffice? Please let me know.
Thanks again.

[SuperFamdam]

Yup, I also wanted to ask is it ok to use the discriminant method of saying b^2 - 4ac <0, it just seems too quick of a working out to be right. Can you please verify this? Thank you very much for all your vids :) Awesome

[AchillesMalcomson]

Can you explain why not? It seems like sound logic to me.

[Minasiu]

Using the completing the square rule, wouldn't it be (x+1/2)^2 - 1/2^2 which would be (x+1/2)^2 -1/4 ?

[karimkarass]

Anyone here watching last minute before the exam?😂