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The length of a rectangular game reserve is 3 miles longer than twice the
width. The area of the reserve is 27 square miles. What is the width of the
reserve

Sagot :

Answer:

Width of the  reserve = 3 miles

Step-by-step explanation:

Given:

Area of game reserve = 27 square miles

Length of rectangular game reserve = 3 miles + 2[width]

Find:

Width of the  reserve

Computation:

Assume;

Width of the  reserve = w

So,

Length of rectangular game reserve = 3 miles + 2[width]

Length of rectangular game reserve = 2w + 3

Area of rectangle = l x b

Area of game reserve = Length of rectangular game reserve x Width of the  reserve

27 = [2w + 3][w]

2w² + 3w = 27

2w² + 3w - 27 = 0

2w² + 9w - 6w - 27 = 0

w(2w + 9) - 3(2w + 9) = 0

(2w + 9)(w - 3)

So,

w = -9/2

w = 3

So,

Width of the  reserve = 3 miles