AS & A Level Maths No 2 Inequalities-from www.mathstutor.biz

Solving linear and quadratic inequalities.This is the opening of the fourth lesson from "AS" and "A" Level Mathematics DVD video PART ONE available from www.mathstutor.biz

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[TheJac2000]

Thanks, nice video. But when do we know the graph opens upward or downward? dont we need to do completing square to find out? or is there a faster way?

[mathstutorbiz]

@TheJac2000 All the examples in the clip are positive x "squared", if negative x "squared" parabola up the other way. ok. mathstutor

[heroalif]

During the first 3-part inequality, you didn't switch the sign after deviding. This then implies that we only switch the sign when dealing 2-part inequalities. Is that so?

[mathstutorbiz]

@heroalif No...... Only "switch" the sign when dividing by any negative value. mathstutor

[Time2Splitt]

Easy to understand vids, cheers.

Just being picky, but shouldn't 5:32 be, "this is more than nought"

[mathstutorbiz]

Listen again. I say, between "there" and "there" is less than nought.... which is true, maybe while pointing at > was not a good idea.... I go on to expalin greater than nought... so no mistake

[carlalovesyou2]

your videos are really helpful, thanks so much

[sanojnevets]

Wow you are the coolest. You offer free help to those who are having tough times understanding math. I will add you to my favorites. Thank you so much, you are truly the man!

[SpikedWarrior]

Dude!! I didnt have a clue about this until now! Thankyou so much u british hero!

[TheNextAnstine]

thanks british ur a smart dude

[Varisk1]

@TheJac2000 if X is greater than zero than the graph is a smile vice versa

[Richtea5]

really useful videos :) good revision

Thank you!!!

[TheJac2000]

@mathstutorbiz Thank you

[heroalif]

@mathstutorbiz Thanks.