All Junior Cert Mathematics posts
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    Maths paper 1, last question sorecauvanesa

    What did everyone get for c in the last question

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      Daniel_7788

      180

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      darraghob

      i got:

      a = 20

      b = -120

      c = 180

      im not entirely sure its right but when i checked with my friend after he said he got the same

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      sorecauvanesa

      I got 180 too I hope it's the right answer

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      Daniel_7788

      And I got 30 and -30 for a and b not sure what order

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      caolanf

      I got a=20, b=-120 and c=180

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      G Kennedy

      What is answer to 17 increase by 6% decrease by 6%?

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      G Kennedy

      By the way I got 20 -120 and 180 too

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      Daniel_7788

      €18.02 and 5.7percent decrease

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      sorecauvanesa

      I got 7. something I can't remember

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      sorecauvanesa

      I meant 5

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      SryanBruen

      I got two answers for C actually... 180 and 0 - I got 0 by picking two coordinates and then filling into the slope formula and then filling into the equation of the line formula (y = mx + c). That was one of the few questions I was unsure with.

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      G Kennedy

      Thanks got 5.7 too

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      rocky123

      Sryan bruen you shouldn't have use the y=mx+c formula because this is for the equation of a linear line not a quadratic

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      SryanBruen

      Ino I just realised LOL

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      SryanBruen

      https://www.examinations.ie/tmp/1465579580_6922755.pdf

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      SryanBruen

      Oh wait... how is it a Linear line? Sorry.... the x is squared? How is it Linear? Plus it's a U shape?

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      SryanBruen

      Oh wait I read your thing wrong - Man I feel so dumb right now. Very sorry...

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      rocky123

      Its fine

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      rocky123

      This is a fully worked solution to this part of the question

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      EH458

      Thank god someone else got the same as me πŸ’†πŸΌπŸ’†πŸΌπŸ’†πŸΌ

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      Gerardgalv

      does someone want to tell me how the y=mx+c works ? isnt this a quadratic as it is a U shape but then it only has one root ? thanks whoever

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      Gerardgalv

      For Question 3 can someone tell me which side the 4 and the 8 went on ?

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      AubernGene

      I got c=180 b=120 and a= -20 would mixing uo the signs lose a lot of marks??

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      Me

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