Question

me ajudem com a numero 4 pfff

Answer 1

Sejam a=x-1       b=x+1         S=(x-1)(x+1)       S=224 m²

(x-1)(x+1)=224      x² +x-x +1-224=0       x²-225=0     x²=225    x=15 m

a)   a=15-1=14m     b=15 +1=16 m

b) Cerca=2(14+16)=30m