Question

X+y=18
Xy=72
Find the value of x

Answer 1

Answer:

X can be 6 or 12. This is your answer

Answer 2

Step-by-step explanation:

x + y = 18 ---(1)

xy = 72 ---(2)

From equation 2 , we get,

y = 72/x

put y = 72/x in equation (1) ,we get,

x + 72/x = 18

x^2 + 72/ x = 18

x^2 + 72 = 18

x^2 - 18x + 72 = 0

x^2 -12x - 6x + 72 =0

x(x- 12) -6 (x - 12) = 0

(x - 12) (x - 6) = 0

x - 12 = 0 , x - 6 = 0

x = 12 , x = 6 Ans.