Question 16The real number $x$ satisfying $x/a+a/x=b$ equals which expression?$\frac{-b\pm\sqrt{b^2-4a^2}}{2a}$$\frac{ab\pm a\sqrt{b^2-4}}2$$\pm\sqrt{b-a^2}$$\frac{b\pm\sqrt{b^2-4}}{2a}$$\frac{b\pm a\sqrt{b^2-4}}2$