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17 October, 01:17

A rectangle has an area of 30 scuare meters and a perimeter of 34 meters what are the dimensions of the rectangle?

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  1. 17 October, 01:37
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    P = 34 = 2 (l + w) | : 2 = > l + w = 17 = > w = 17 - l

    A = 30 = l*w

    30 = l (17 - l)

    17l - l² - 30 = 0 | (-)

    l² - 17l + 30 = 0

    l² - 2l - 15l + 30 = 0

    l (l - 2) - 15 (l - 2) = 0

    (l - 15) (l - 2) = 0

    l - 15 = 0 = > l₁ = 15 m = > w₁ = 2 m

    l - 2 = 0 = > l₂ = 2 m = > w₂ = 15 m
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