Posted by **lia ** on Tuesday, August 6, 2013 at 9:48pm.

The perimeter of the quadrilateral is 80feet. Find the length of the other sides.

One side is x+9 another is x+13, 4x-5, x^2-8x.

- math -
**Reiny**, Tuesday, August 6, 2013 at 10:20pm
Let's just add up the four sides you gave

x+9 + x+13 + 4x-5 + x^2 - 8x = 80

x^2 -2x -63 = 0

(x-9)(x+7) = 0

x = 9 or x = -7

case1: x = 9

the sides are: 18 , 22 , 31 , and 9

check: 18+22+31+9 = 80

case 2: x = -7

the sides are: 2, 6 , -33 ---- makes no sense .....

the sides are

18 , 22 , 31 , and 9

## Answer this Question

## Related Questions

- college math - 1). Sum of three numbers is 45. One number is five more than the ...
- math - the sides of a quadrilateral are in the ratio 1:3:5:7. if the perimeter ...
- Math - If the sides of a quadrilateral are in the ratio of 3:5:7:9 and the ...
- math - the perimeter of an isosceles triangle is 21 meters. the length of one ...
- math - The perimeter of a quadrilateral is 56. The lengths of three consecutive ...
- easy geometry - 1)If diagonals of a rhombus are 10 cm and 24 cm. find the area ...
- Algebra 1 - Two sides of a triangle have the same length. The remaining side is ...
- Algebra 1 - Two sides of a triangle have the same length. The remaining side is ...
- Math--Area - Find the area of each regular polygon to the nearest tenth. Octagon...
- math - Now consider a rectangle of perimeter 20cm.let one side be x find the ...

More Related Questions