Which strategy is correct when simplifying this expression?
A^-4 x a^5 x a^2
• Add the bases, and multiply the exponents to get 3a -40
• Add the bases, and add the exponents to get 3a.
• Keep the common base, and multiply the exponents to get a -40
Keep the common base, and add the exponents to get a.
Keep the common base, and add the exponents to get a^3.
The correct simplification of the expression A^-4 x a^5 x a^2 is a^3.