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The width of a rectangular photograph is 5cm more than the height. The area is 80cm squared. Find the height of the photograph.

  • maths -

    let the height be h
    then width is h+5

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

  • maths -

    but how do u solve h(x+5)=80
    i have never come across ones like these.

  • sorry typo ... maths -

    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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