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Triangles and algebra A-level maths
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CookyLil
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I have this question on a homework where we are given a triangle labelled A, B and C
angle A= 120 degrees
length AB =x-1
length BC =x+1
length AC =2x1
I am meant to find the value of x
I have tried working it out by using the cosine rule, however, my equation turned out to have no real roots so I do not know where I went wrong. Any help?
angle A= 120 degrees
length AB =x-1
length BC =x+1
length AC =2x1
I am meant to find the value of x
I have tried working it out by using the cosine rule, however, my equation turned out to have no real roots so I do not know where I went wrong. Any help?
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mqb2766
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0le
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#3
I have tried the problem using:
or 
In one case I also got complex roots, in the other case I get two real numbers but both could lead to negative distances.
It is possible I may have made an algebraic mistake or misunderstood the question as well.
As above, it would help if you showed your working out and also upload the question in its original format.
or In one case I also got complex roots, in the other case I get two real numbers but both could lead to negative distances.
It is possible I may have made an algebraic mistake or misunderstood the question as well.
As above, it would help if you showed your working out and also upload the question in its original format.
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mqb2766
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#4
(Original post by 0le)
I have tried the problem using:
or
In one case I also got complex roots, in the other case I get two real numbers but both could lead to negative distances.
It is possible I may have made an algebraic mistake or misunderstood the question as well.
As above, it would help if you showed your working out and also upload the question in its original format.
I have tried the problem using:
or In one case I also got complex roots, in the other case I get two real numbers but both could lead to negative distances.
It is possible I may have made an algebraic mistake or misunderstood the question as well.
As above, it would help if you showed your working out and also upload the question in its original format.
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