Respuesta :

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(2x + 1)(x - 5)

Simplify this by using the rainbow tactic. :) 

(2x · x) + (2x · -5) + (1 · x) + (1 · -5)

Simplify! 

(2x²) + (-10x) + (x) + (-5)

Get rid of the parenthesis.

** Remember : a negative times a positive is always a negative, and a negative times a negative is always a positive. **

2x² - 10x + x - 5

Add like terms.

2x² + (-10x + x) - 5

Since "-10x" & "x" have the same variable, we can simplify this.

Simplify.

2x² + (-9x) - 5

Get rid of parenthesis.

2x² - 9x - 5

~Hope I helped!~

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