Question

已知(x-12)的三次方=27,(2y-1)方=169,求x方-y的平方根

Answer 1

(x-12)^3=27

那么x-12=3 ,

x=15

(2y-1)^2=169

2y-1=±13

∴y=7或y=-6

∴x^2-y^2

=225-49

=176

或

x^2-y^2

=225-36

=189