SOLUTION: 5x(4th power)(2xy-9x(cubed))
-> SOLUTION: 5x(4th power)(2xy-9x(cubed))
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(5x^4) times (2xy - 9x^3) =
Multiply (5x^4) by every term inside and add the exponents.
(5x^4) times (2xy) = 10x^5(y).
(5x^4) times (-9x^3) = -45x^7
We now put it all together.
10x^5(y) - 45x^7