Question

if X + Y is the geometric mean between X + 2 and X + 9 find the value of x​

Answer 1

Answer:

geometric mean G=√ab

X+Y= √(X+2)(X+9)

squeezing both side

(X+Y)^2=(X+2)(X+9)

X^2+Y^2+2XY = X^2+11X+18

Y^2+2XY=11X+18