Example:
The "x" is where the base is, the "2" is the power/exponent of the base
The 3rd quotient:
does not belong with the other three because it has two different bases of -4 and -3. [You can't combine powers/exponents if they have different bases.]
The other quotients have the same bases:
same base of -10
same base of 6
same base of 5