Question

What are the numbers with a sum of 9 and product of -10

Answer 1

-1 , 10 and 10 , -1

Explanation:

hello :

if x , y this numbers you have the system : x+y =9.....(*)

xy = -10.....(**)

use (*) : y = 9 - x

put this value of y in (**) : x(9-x) = -10

9x - x² = - 10

x²-9x - 10 = 0

(x+1)(x-10)=0 means : x+1 = 0 or x -10 = 0

x = - 1 or x=10

if : x= -1 y = 9-(-1)=10

if : x= 10 y = 9-(10)=1