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Please, please help. Maths coursework question?

Using the co-ordinates, find x when 3x²-20x+24=0?

https://s.yimg.com/hd/answers/i/0bad43525cc7405980d7e93906c29947_A.png?a=answers&mr=0&x=1493739019&

Using algebraic techniques, show that this answer is correct?

Thank you so, so much for your help!
(edited 6 years ago)
Original post by Madelaiine
Using the co-ordinates, find x when 3x²-20x+24=0?

https://s.yimg.com/hd/answers/i/0bad43525cc7405980d7e93906c29947_A.png?a=answers&mr=0&x=1493739019&

Using algebraic techniques, show that this answer is correct?

Thank you so, so much for your help!


Fix link please.
I just get a page saying "Unauthorised"
Or use LaTex to type it: https://www.thestudentroom.co.uk/wiki/LaTeX
Reply 2
Original post by ThatsAGoodOne349
Fix link please.
I just get a page saying "Unauthorised"
Or use LaTex to type it: https://www.thestudentroom.co.uk/wiki/LaTeX


Oops! Sorry about that, hope this link is okay:
https://ibb.co/c4m4RQ
Original post by Madelaiine
Using the co-ordinates, find x when 3x²-20x+24=0?

https://s.yimg.com/hd/answers/i/0bad43525cc7405980d7e93906c29947_A.png?a=answers&mr=0&x=1493739019&

Using algebraic techniques, show that this answer is correct?

Thank you so, so much for your help!


Use completing the square or its generalised form, the quadratic formula.
Original post by Madelaiine
Oops! Sorry about that, hope this link is okay:
https://ibb.co/c4m4RQ


Try factorising using:
ac = 24×324\times3
b = 20 -20

and remembering that extra step of splitting the equation then factorising into brackets :smile:

If that doesn't work the you will have to try completing the square and then failing that, you would have to try the quadratic formula. (the method of completing the square would give you a fraction inside the bracket, if you are not okay with doing it using fractions then don't)

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