13. sqrt (k+2)-x=0 Jika nilai x=9 maka nilai k adalah __

7

The question gives us the equation √k+2-x=0 and tells us the value of x=9. To ascertain the value of k, we are going to fill the value of x into the equation and resolve it.So the equation will transform as:√k+2-9=0Which would be simplified as:√k-7=0For an equation of a square root to be equal to zero, the component under the root sign has to be equal to zero as well, hence, k-7=0.Now we will solve this equation for k.