Maths-
General
Easy

Question

square root of k plus 2 end root minus x equals 0
In the equation above, k is a constant. If x = 9, what is the value of K ?

  1. 1
  2. 7
  3. 16
  4. 79

The correct answer is: 79


    Solution:-
    • Given equation is square root of k plus 2 end root minus x equals 0.
    • k is constant and x = 9
    • Lets solve the equation, add x to both sides of equation, we get,
    square root of k plus 2 end root equals x
    • As the value of x is given we will put it into the equation to find the value of k.square root of k plus 2 end root equals 9
    • Squaring on both sides we get,
    k+2 = 81
    • Subtract 2 from both sides we get,
    k = 79
    • Therefore the value of k is 79, correct option is (D)79.
     

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