Question

me ajudem porfavor preciso dela resolvida

Answer 1

b=h+3
A=S=(b.h)/2
A=((h+3)h)/2
A=(h²+3h)/2
27=(h²+3h)/2
54=h²+3h
0=h²+3h-54
Δ=9-4.-54.3=657
h=(-3+/-√657)/2
h'=(-3+3√73)/2
h''=(-3-3√73)/2⇒negativo

b=3+(-3+3√73)/2
b=(3+3√73)/2