Respostas

2013-07-07T15:56:01-03:00
F(x)=x² +x²+2x+1
f(x)=145
 
x² +x²+2x+1=145
2x²+2x-144=0
x²+x-72=0

Delta= 1+288=289

x= -b+(raiz quadrada de 289)/2
x=16/2=8

R=  x=8      x+1=9