If the solution of an equation is x=-2 what could the original equation be?

You can formulate anything here as long as you can substitute x for -2 and you get the right answer (IE both sides of the equation balance).

Examples:
x + 2 = 0
x + 4 = 2
or even something like
x + y = -2 - y

a - base

b - exponent

so,

the base is 8the exponent is 3the exponent tells you to multiply 8 together three timesthe expanded form is 8*8*8