Question

In the equation above, k is a constant. If x = 9, what is the value of K ?

- 1
- 7
- 16
- 79

## The correct answer is: 79

### Solution:-

- Given equation is .
- k is constant and x = 9
- Lets solve the equation, add x to both sides of equation, we get,

- As the value of x is given we will put it into the equation to find the value of k.
- 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.

* *

### Related Questions to study

What value of *x *satisfies the equation above?

**Note: **

Whenever we encounter a square root while solving an equation, our first attempt should be to somehow remove the square root by squaring both sides and get a simpler equation to solve. Another way to find the value of x which satisfies the equation would be to simply put the values in the options in the equation and check if it is satisfied

What value of *x *satisfies the equation above?

**Note: **

Whenever we encounter a square root while solving an equation, our first attempt should be to somehow remove the square root by squaring both sides and get a simpler equation to solve. Another way to find the value of x which satisfies the equation would be to simply put the values in the options in the equation and check if it is satisfied

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The circle circumference is the length when we cut it, open and draw a straight line from it.

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The circle's radius is considered when applying the formula to determine the circumference of the circle.

Therefore, to calculate a circle's circumference, we must know its radius or diameter.

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where,

R is the circle's radius.

π is a mathematical constant with an estimated value of 3.14 (to the nearest two decimal places).