Homework Help: Gr10 math

Posted by Rebecca on Tuesday, May 31, 2011 at 1:39pm.

A rectangular lawn measuring 8m by 4m is surrounded by a flower bed of uniform width. The combined area of the lawn and the flower bed is 165m^2. What is the width of the flower bed?

Gr10 math - MathMate, Tuesday, May 31, 2011 at 3:33pm
Let w=width of flower-bed.

total area, A
= (8+x)(4+x)
=x²+12x+32

Equate A above to 165 m² to get
x²+12x+32 = 165
and solve for x.
Reject the negative root (-19).

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