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April 21, 2014

April 21, 2014

Posted by **nabiha** on Tuesday, April 20, 2010 at 5:15pm.

- maths -
**Reiny**, Tuesday, April 20, 2010 at 5:24pmlet the height be h

then width is h+5

solve h(x+5) = 80 as a quadratic

- maths -
**nabiha**, Tuesday, April 20, 2010 at 5:29pmbut how do u solve h(x+5)=80

i have never come across ones like these.

- sorry typo ... maths -
**Reiny**, Tuesday, April 20, 2010 at 5:39pmshould have been

h(h + 5) = 80

h^2 + 5h - 80 = 0

using formula

h = (-5 ± √ 345)/2

= 6.78 or some negative number

so height is 6.78

width = 11.78

area = 6.78x11.78 = 79.87

don't know what accuracy you needed in the answer.

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