A-Level Edexcel C3 June 2010 Q2 : ExamSolutions

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[shararzaid]

The exams were really easier back then, 10 years ago. Keep up the good work, Mr. Stuart.

[ExamSolutions_Maths]

@LolzWhatIsThis So you get 3=1/9 + c so c = 26/9 . Then y = x/18 + 26/9. Multiply by 18 to give 18y = x + 52 then rearrange to give x - 18y + 52 = 0 Hope you get that now?

[ExamSolutions_Maths]

You misheard me. I said the quotient rule which is different from the quadrant rule.

[LNGY]

@ExamSolutions
Thank you, after seeing your reply. Turns out that I made a horrible algebraic error. Thank you for the response.

[ExamSolutions_Maths]

The quadrant rule is for solving trig. equations. Confused?

[TrickzL]

Hi Stuart I wanted at 3:30 when you explain why we should not use the quotient rule since we don't have 2 functions of x, you said you can use it if you want but you dont recommend it. Why is that?Because everytime i use quotient rule for fractions when you dont have functions of x on top and bottom i still get the same answer as if i was to do product rule. Do you lose solutions or something in the odd scenario?or do examiners not like it?Just want to know your take on why you dont recommend it when it works like the other methods

[flowerpower]

Oh right. I get how to do this question, but if one, attempted to solve this question with the quotient rule then would it still yield the same answer?

[HKqLimAxzU]

Hi, how come you didn't use the quotient rule for this question?

[hiyouJ]

@ExamSolutions was wondering if i could use the quotient rule for differentiating y? I tried and it doesn't seem to work, instead i get -17 as my answer when x=2

[HKqLimAxzU]

Hi, I now get that the chain rule is used because of the indice to the expression, but I'm not sure what you mean by the quadrant rule, is that essentially the same as the quotient rule.

[xxNEEDyouTObiteMExx]

I used the quotient rule and got dy/dx = -18/(5-3x)to the power of 3
Not sure where I went wrong :/

[LNGY]

I get a different EQ when i use y=mx+c instead of y-y1=m(x-x1)
3=1/18(2)+c

Why?