Perimeter of

isosceles is 36 find the 2 unequal sides

no way to tell. If the base is 2, the sides are 17

If the base is 10, the sides are 13.

If the base is x, and the sides are y, you know that

x + 2y = 36
And, you know that x < 2y or the base is so long that the sides won't reach the ends.