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9. Which expression represents the area of the rectangle below in square units?

The left side of the rectangle is 2x.

The bottom side of the rectangle is 3x+2.

The other two sides are blank.

 

Answer choices:

a. 6x+2

b. 10x+4

c. 5x²+4x

d. 6x²+4x

 

10. Simplify the expression.

3x³ - 4x² + 2x + 1 - (3x³ + 4x² - 2x + 1)

 

a. 0

b. -8x² + 4x

c. 6x³ + 2

d. 6x³ - 8x² + 4x + 2

 

Please help!! Show work please. Thank you.

mathelp  Mar 29, 2018
edited by mathelp  Mar 29, 2018
edited by mathelp  Mar 29, 2018
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9.   The area  is   (3x + 2)  (2x)  =   [ 6x^2 + 4x ]  units^2

 

10. 3x³ - 4x² + 2x + 1 - (3x³ + 4x² - 2x + 1)  =

 

3x^3  - 4x^2  + 2x  + 1  - 3x^3 - 4x^2 + 2x  - 1       combine like terms

 

-8x^2 + 4x

 

 

cool cool cool

CPhill  Mar 29, 2018

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