question_answer

Let two numbers have arithmetic mean 9 and geometric mean 4. Then these numbers are the roots of the equation ______.

A)  \[{{x}^{2}}+18x-16=0\]        

B)  \[{{x}^{2}}-18x-16=0\]

C)  \[{{x}^{2}}+18x+16=0\]

D)  \[{{x}^{2}}-18x+16=0\]