Question

calcule as raises A]f(x)=x²+9x+8

Answer 1

f(x)=ax²+bx+c=x²+9x+8  a=1,b=9 e c=8

x'=[-b+√(b²-4*a*c)]/2a
x''=[-b-√(b²-4*a*c)]/2a

x'=[-9+√(81-32)]/2=-2/2=-1

x''=[-9-√(81-32)]/2=-16/2=-8