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Katen [24]
3 years ago
11

Question 19 I know the answer is 1.5 but how

Mathematics
1 answer:
katrin2010 [14]3 years ago
5 0
Suppose the width of the path is x. 
the dimensions of the extended rectangle are (12+x+x), and (16+x+x) 
(12+2x)(16+2x)=285
4x²+56x+192=285
4x²+56x-93=0
Not easy to factor it, so use the quadratic formula to solve:
x={-56+√[(56²-4*4*(-93)]}/2*4 or x={-56-√[(56²-4*4*(-93)]}/2*4
x=1.5 (ignore the negative solution.)
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