Question

Check my answer? Choose the correct simplification of (4x3y4z5)(5x4y5z3).

.

20x12y20z15
9x7y9z8
9x12y20z15
20x7y9z8
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I picked the last one because I'm pretty sure you at the exponents, however I'm not sure if you add the 4x and 5x or multiply them?

Answer 1

hint:
\[\left( {4{x^3}{y^4}{z^5}} \right)\left( {5{x^4}{y^5}{z^3}} \right) = 4 \times 5\left( {{x^3}{x^4}} \right)\left( {{y^4}{y^5}} \right)\left( {{z^5}{z^3}} \right) = ...?\]

Answer 2

So i was correct? :D

Answer 3

yes!

Answer 4

Thank you! :)

Answer 5

Thank you! :)