Monday

April 21, 2014

April 21, 2014

Posted by **steven** on Sunday, July 12, 2009 at 10:57am.

- math -
**Marth**, Sunday, July 12, 2009 at 11:10amlet x = the width of the border

The combined area of the picture with the border = (100+x)(55+x)

(100 + x)(55 + x) = 9796

5500 + 155x + x^2 = 9796

-4296 + 155x + x^2 = 0

Now, use the quadratic equation to find x.

x = (-b +/- sqrt(b^2 - 4ac))/2a

With these numbers, I assume a calculator is allowed.

x = 24, -179

The width of the border cannot be negative, so x = 24cm.

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