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March 29, 2015

March 29, 2015

Posted by **Liz** on Thursday, October 20, 2011 at 8:59am.

The width of a rectangle is 5 ft, its length is (3x+2) ft, and its area is 75 ft². Find x

- Algebra Please help!!!! -
**Reiny**, Thursday, October 20, 2011 at 9:01amarea = length x width

so ...

5(3x+2) = 75

expand, then solve for x,

- Algebra Please help!!!! -
**Liz**, Thursday, October 20, 2011 at 10:39amThat's what I was thinking as well but the 75 being squared is throwing me off. Do I need to write it as

5(3x+2)=75²?

- Algebra Please help!!!! -
**Reiny**, Thursday, October 20, 2011 at 10:54amno, just keep it as 75

they are square units, and the left side of the equation is also in square units

15x + 10 = 75

15x = 65

x = 65/15 = 13/3

then your length is 3(13/3) + 2 = 15

check:

5x15 = 75

- Algebra Please help!!!! -
**Liz**, Thursday, October 20, 2011 at 11:53amThank you!! That's what I thougth but I was thrown off by the square root.

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