Posted by nabiha on Tuesday, April 20, 2010 at 5:15pm.
The width of a rectangular photograph is 5cm more than the height. The area is 80cm squared. Find the height of the photograph.

maths  Reiny, Tuesday, April 20, 2010 at 5:24pm
let the height be h
then width is h+5
solve h(x+5) = 80 as a quadratic

maths  nabiha, Tuesday, April 20, 2010 at 5:29pm
but 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 5:39pm
should 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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