Question

Todd simplified the following expression:


(x8 y−2)(x4 y5)


His final answer was in the form xm yn. If he simplified the expression correctly, what is the value of n, the exponent on y?

Answer 1

i take it it is
\[\large x^8y^{-2}x^4y^5\]

Answer 2

add the exponents on the like terms and get
\[\large x^{8+4}y^{5-2}\] and take it from there