mathmaster9531 mathmaster9531

24-05-2017
Mathematics

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The area of a rectangle is 64 square centimeters. The rectangle is 4 centimeters wide. How long is the rectangle.

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crisforp crisforp

24-05-2017

The Area is the width times the height: A = w x h;
Then, 64 = w x h;
h = 4 + w;
64 = 4w + w^2;
w^2 + 4w - 64 = 0;
We solve this equation: w1 ≈ 6,24 > 0 (okay); w2 ≈ - 10,24 < 0 (not okay);
Finally, h1 ≈ 10,24;

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