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# Urgent maths help needed

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https://vle.mathswatch.co.uk/images/questions/question15829.png

Got to give homework back tomorrow.

So far, this is my working:

924  =  4 ( x + 1) (x + 11)
231  = (x + 1) (x + 11)
231 =   x^2 + 12x + 11
x^2 + 12x - 220  = 0
(x + 22) ( x - 10) = 0

x=10 x=-22

4, (10 +1), (10 + 11)=
4,11,21

… but I still only get 5/7 marks

Do you know what else i need to add?

Dec 12, 2018

#1
+203
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You have the answer: 4, 11, 21. Negative dimensions do not exist in the real world.

I think you need to add the units to make it 4cm, 11cm, 21cm

Dec 12, 2018
#2
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i've tried that and still nothing

Guest Dec 12, 2018
#3
+700
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Did you attempt the problem before and get it wrong? if you did, (I know the website you are on ) then even if you get it right the next time, it will only give 5/7, not 7/7. If you attempt two times and get those attempts wrong, but get the third attempt correct, then you score 3/7 points. This process continues al the way until 1/7.

Dec 13, 2018
edited by PartialMathematician  Dec 13, 2018
edited by PartialMathematician  Dec 13, 2018