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January 26, 2015

January 26, 2015

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

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

- math -
**Reiny**, Tuesday, August 6, 2013 at 10:20pmLet'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

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