What is 2x^2y^4z^5 x 4x^3y^5z^2?
A. 8x^5y^9z^7
B. 6x^5y^9z^7
C. 8x^6y^9z^7
D. 8x^6y^20z^10
To multiply the two expressions, add the exponents when the bases are the same:
2x^2y^4z^5 * 4x^3y^5z^2
= 8x^5y^9z^7
Therefore, the correct answer is:
A. 8x^5y^9z^7