Question

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

(a) x² + 18x – 16 = 0 

(b) x² – 18x + 16 = 0

(c) x² + 18x + 16 = 0 

(d) x² – 18x – 16 = 0.

Answer 1

(b) : Let the two number be α, β