9 (xy)² - 4 (xy) - 13
Answers
Answered by
0
Step-by-step explanation:
let xy = z then
9z² -4z -13 = 0
9z²-(13-9)z-13=0
9z²-13z+9z-13=0
z(9z-13)+1(9z-13)=0
(9z-13)(z+1)=0
z = 13/9 , z = -1
xy= 13/9 , xy=-1
Similar questions