Question

think of a positive number, say x. from the square of this number subtract 3 times of itself. if the result is 10, find x.

Answer 1

x3 -3=10》x3=10+3=13》x= (13)3=2197

Answer 2

x=-2 or 5
x^-3x-10=0
product of roots is -10
sumof roots is -3 therefore the roots must be (x-5);  (x+2)
then x=5  x=2