+0  
 
0
54
7
avatar

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

 

What is the answer to the question on the link please?

Got to give homework back tomorrow

 Dec 12, 2018
 #1
avatar+94209 
+2

Ok....we have this

 

924  =  4 ( x + 1) (x + 11)     divide both sides by 4

 

231  = (x + 1) (x + 11)      simplify

 

231 =   x^2 + 12x + 11     subtract  231 from both sides

 

x^2 + 12x - 220  = 0       factor as

 

(x + 22) ( x - 10) = 0

 

Set both factors to 0  and solve for x and we get that

 

x =  -22    (reject)     or    x  = 10  (accept)

 

Dimensions of cuboid  are

 

4, (10 +1), (10 + 11)  =

 

4, 11, 21

 

 

cool cool cool

 Dec 12, 2018
 #2
avatar
0

Thanks, i checked the answer but still got 5/7 marks. Do you know what elese i need to add?

 

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
 

Guest Dec 12, 2018
 #4
avatar+94209 
+1

Man, I don't know....this seems pretty complete, to me....

 

I don't know what else they are looking for....

 

 

 

cool cool cool

CPhill  Dec 12, 2018
 #5
avatar
0

ok thanks anyways

Guest Dec 12, 2018
 #7
avatar+812 
0

The answer is complete

PartialMathematician  Dec 13, 2018
 #3
avatar
0

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

 

What is the answer to the question on the link please?

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
 #6
avatar+812 
0

Did you attempt the problem before and get it wrong? if you did, (I know the website you are on wink) 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. 

 

 - PM

 Dec 13, 2018

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