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X^2-81 /64 =0
(X-9)(X+9) /64 =0
(X-9)(x+9)=0*64
(X-9)(x+9)=0
Igualando cada factor a 0
X-9=0
x=9
X+9=0
X=-9
Por formula
a=1
b=0
C=-81
X=(-0+-raiz (0 -4*1*(-81)))/2*1
X= +-raiz(+324)/2
X= +-18/2
X1= 9
X2= 9