This is a factored trinomial. In order to find the trinomial you need to use the distributive property.

x times 2x is 2x^2

x times -4 is -4x

5 times 2x is 10x

5 times -4 is -20

so you get 2x^2-4x+10x-20

combine the two x terms -4x+10x is 6x

2x^2+6x-20

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