calcule as raises A]f(x)=x²+9x+8
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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
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
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