Answer :
If it is (xy)^2= 900 and if it is xy^2=90
Because: x=10 and y= -3
(10^2 * (-3)^2 )= 100 * 9= 900
or
x=10, y= -3
(10* (-3)^2)= 10*9=90
Because: x=10 and y= -3
(10^2 * (-3)^2 )= 100 * 9= 900
or
x=10, y= -3
(10* (-3)^2)= 10*9=90