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A=ab
5600=ab
b= 5600/a
P=2a+2b
300=2a+ 2(5600/a)
300= 2a+ 11200/a
(2a^2 +11200)/a= 300
2a^2 +11200= 300a
2a^2 -300a+ 11200=0
Simplificamos dividiendo todo entre 2.
a^2 -150a + 5600=0
(a-80)(a-70)=0
a-80=0
a=80m... base.
a-70=0
a=70
Obtenemos b.
b=5600/a
b=5600/80
b=70m... altura.