Answers

2016-08-04T09:38:12+08:00
Lw=6.75;
l=3w;

3w[w[=6.75;

3w^2=6.75;

w^2=6.75/3;
w=1.5;

l=4.5
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2016-08-04T22:01:46+08:00
Let x be our width
A=lw
width=x
length=3x
A=3x(x)
A=3x^2
3x^2=6.75
get the roots
x=1.5 and x=-1.5
discard the negative root
so x=1.5
substitute to the dimensions
Width=x
w=1.5
length=3x
l=3(1.5)
l=4.5
A=lw
A=4.5(1.5)
A=6.75
dimensions
length=4.5
width=1.5
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