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KVPY2017MathematicsTrigonometric Equations

One of the solutions of the equation 8 ³ -7 + 3 =0 lies in the interval

Options

  1. A(0,10^ ]
  2. B(10^ , 20^ ]
  3. C(20^ , 30^ ]
  4. D(30^ , 40^ ]

Correct answer

B. (10^ , 20^ ]

Step-by-step solution

array l 6 -2 3 -7 + 3 =0 3 - =2 3 array It can be written as array l 2 ( (60^ - ) )=2 3 (60^ - )= 3 60^ =4 array =15^ is one of the value

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