Respuesta :

A ------- M -------- B

AM = 65

AB = 12x+40

AM + BM = AB

65 + X = 12x+40

65-40 = 12x-x

15 = 11x

x = 1.36

But in the question he should gave you BM
  • A-M-B

If M is the midpoint then then AM is AB/2

[tex]\\ \sf\longmapsto \dfrac{12x+40}{2}=65[/tex]

[tex]\\ \sf\longmapsto 12x+40=65(2)[/tex]

[tex]\\ \sf\longmapsto 12x+40=130[/tex]

[tex]\\ \sf\longmapsto 12x=130-40[/tex]

[tex]\\ \sf\longmapsto 12x=90[/tex]

[tex]\\ \sf\longmapsto x=\dfrac{90}{12}[/tex]

[tex]\\ \sf\longmapsto x=7.5[/tex]

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