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Given-a-b-and-c-3-real-numbers-which-satisfy-the-equation-a-b-c-312-c-a-192-Find-these-real-numbers-such-that-they-form-3-consecutive-terms-of-a-Geometric-Progression-




Question Number 94573 by Ar Brandon last updated on 19/May/20
Given a, b, and c, 3 real numbers which satisfy  the equation  { ((a+b+c=312)),((c+a=192)) :}  Find these real numbers such that they form  3 consecutive terms of a Geometric Progression.
Givena,b,andc,3realnumberswhichsatisfytheequation{a+b+c=312c+a=192Findtheserealnumberssuchthattheyform3consecutivetermsofaGeometricProgression.
Commented by mr W last updated on 19/May/20
a=(b/r)  c=br  ac=b^2 =192  ⇒b=±8(√3)  (b/r)+b+br=312  (1/r)+r+1=((312)/b)  r^2 −(1−((312)/b))r+1=0  r=(1/2)[1−((312)/b)±(√((1−((312)/b))^2 −4))]  r=(1/2)[1±13(√3)±(√((1±13(√3))^2 −4))]
a=brc=brac=b2=192b=±83br+b+br=3121r+r+1=312br2(1312b)r+1=0r=12[1312b±(1312b)24]r=12[1±133±(1±133)24]
Commented by Ar Brandon last updated on 19/May/20
Thanks Mr W
Answered by Rasheed.Sindhi last updated on 19/May/20
Given a, b, and c, 3 real numbers which satisfy  the equation  { ((a+b+c=312)),((c+a=192)) :}  Find these real numbers such that they form  3 consecutive terms of a Geometric Progression.  a+b+c=312  ∧ c+a=192  b=312−192=120  ((120)/r) ,120 ,120r are in GP  ((120)/r) +120 +120r=312  (1/r) +1+r=((312)/(120))=((13)/5)    5+5r+5r^2 =13r    5r^2 −8r+5=0     r=((8±(√(64−100)))/(10))  r is complex   ∴a,c are not real.
Givena,b,andc,3realnumberswhichsatisfytheequation{a+b+c=312c+a=192Findtheserealnumberssuchthattheyform3consecutivetermsofaGeometricProgression.a+b+c=312c+a=192b=312192=120120r,120,120rareinGP120r+120+120r=3121r+1+r=312120=1355+5r+5r2=13r5r28r+5=0r=8±6410010riscomplexa,carenotreal.
Commented by mr W last updated on 19/May/20
maybe he meant a×c=192.
maybehemeanta×c=192.
Commented by Ar Brandon last updated on 19/May/20
Thank you I arrived at the same situation.
Commented by Ar Brandon last updated on 19/May/20
Oh no, it's a+b. I guess there was a problem with the question.

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