Finding m given that \(\displaystyle{\left({m}^{{2}}-{1}\right)}{x}^{{2}}-{3}{\left({3}{m}-{1}\right)}{x}+{18}={0}\) (a) Suppose m

Beckham Short

Beckham Short

Answered question

2022-04-08

Finding m given that (m21)x23(3m1)x+18=0
(a) Suppose m is an integer so that (m21)x23(3m1)x+18=0 has two positive integer roots. Find m.
(b) Now, suppose that we have a triangle ABC with sides a,b,c such that

 c=23m2+a2m8a=0m2+b2m8b=0.
Find the area of ABC.

Answer & Explanation

WigwrannyErarmbmk

WigwrannyErarmbmk

Beginner2022-04-09Added 13 answers

a) (m21)x23(3m1)x+18=((m1)x3)((m+1)x6),
which since m210, gives
x=3m1
or x=6m+1
and easy to see that only m=2 is valid.
cutimnm135imsa

cutimnm135imsa

Beginner2022-04-10Added 21 answers

b) Since a24a+2=0 and b24b+2=0, we obtain following triples for sides-lengths of the triangle:
(2+2,2+2,23)
and (2+2,22,23).
Now, for calculating of the area we can use the following formula:
SΔABC=142(a2b2+a2c2+b2c2)a4b4c4.
For the first we obtain:
S=9+122.
For the second we obtain S=1.

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