AS & A Level Maths No. 4. Equations- from www.mathstutor.biz

Solve simultaneous equations by substitution where one of the equations is a quadratic. This is the opening of the sixth lesson from "AS" and "A" Level Mathematics DVD video PART ONE available from www.mathstutor.biz

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[mathstutorbiz]

Please read previous comment: Yes this method of "squaring out the brackets" will always work. "Square the first term, double first term multiply by second term and lastly square the second term"....... So "and then multiply by the second term" which may or may not be a 3..... most likely not!! Have another view and listen to the video. mathstutor

[AfghanStar4ever]

where 48 came from ????????????/:(

[mathstutorbiz]

@AfghanStar4ever Please have another listen, (16 x 3 =48) but where did the 16 come from,,,,,,, you need to understand the "quick" or "short" way to expand brackets.

Have another listen. mathstutor

[spider49]

does the quick way of solving quadratics at 6:30 always work?

thanks

[mathstutorbiz]

Yes this method of "squaring out the brackets" will always work. "Square the first term, double first term multiply by second term and lastly square the second term"

mattstutor

[MrDollerbill]

@mathstutorbiz

i get how to all of these kind of questions but the questions im getting is alot diffrent like

3a-b=11

2a+b=9

[p6subhrap]

when you double the dirst term(8), then multiply it by the 3, does that work for all equations? thankyou!

[OSBUK]

Sir, I'm confused about a small thing: On the last question, when you substitute x=3 into 3x+y-8=0 you get y=-1, but if you substitute x=3 into the other equation y^2+3x^2=28 you get y=+1. Please help.

[SanctuaryShred]

Thank you! I am actually doing my AS levels in Mathematics and didn't quite understand my textbooks explanations for this method. Much appreciated.

[MrHaddify]

Thank you so much can not tell you how much that helps however this question can also pop up i the GCSE papers which is what i am going to do soon gunna revise my head off tomorrow!

[sprogsy10]

ty