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MHT CET202013 Oct 2020Morning ShiftMathematicsProperties of TrianglesActual

In ABC with usual notations a =4, ~b =3, A =60^ , then c is a root of the equation

Options

  1. Ac²-3 c-7=0
  2. Bc²-3 c+7=0
  3. Cc²+3 c-7=0
  4. Dc²+3 c+7=0

Correct answer

A. c²-3 c-7=0

Step-by-step solution

A= b²+c²-a² 2 b c 60= 1 2 = 9+c²-16 2 3 c 1= c²-7 3 c 3 c=c²-7 c²-3 c-7=0

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