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Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. Release your mouse button when the item is place. If you change your mind, drag the item to the trashcan. Click the trashcan to clear all your answers.

Place the indicated product in the proper location on the grid. Write your answer in descending powers of x.

(x2 + 2x - 1)(x2 + 2x + 5)

 

 

 

Guest Nov 13, 2017
 #1
avatar+86859 
+1

(x^2 + 2x - 1)(x^2 + 2x + 5) =

 

x^2 * x^2    + x^2 *2x +  5x^2   =  x^4 + 2x^3 + 5x^2    (1)

 

2x*x^2 + 2x*2x + 10x  =  2x^3 + 4x^2 + 10x   (2)

 

-1*x^2 - 1*2x - 1*5  =   -x^2 - 2x - 5   (3)

 

Combining (1) (2) (3)  we have

 

x^4 + 4x^3  + 8x^2 + 8x - 5

 

 

cool cool cool

CPhill  Nov 13, 2017

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