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A square playground has an area of (9x2 + 60x + 100) ft2. The side length of the playground is (mx + n) ft where m and n are whole numbers. Find an expression for the perimeter of the playground. Find the perimeter when x = 7 feet.

Respuesta :

choixongdong
A = (9x2 + 60x + 100)  = (3x + 10)^2 or = (3x + 10)(3x + 10) ft^2

so the side length = (3x + 10) feet

when x = 7 feet.

P = 4 * (3x + 10)
P = 12x + 40
P = 12(7) + 40
P = 84 + 40
P = 124 feet

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