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Don’t understand how to do this

Don’t understand how to do this-example-1
User Joealba
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Multiplication with unknown actually isn't much different from usual vertical multiplication we do,you can refer to the steps above.

Basically,it is 3x^2-5x+1 seperately times 4,2x and x^2,then we would add them up.

Thus the answer is D.

Apologies for my terrible handwriting^^;
Hope it helps!
Don’t understand how to do this-example-1
User Spacey
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