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by comparing with equation
a x^{2} +bx+c=0
for equation
 x^{2} -10x+18=0,a=1,b=-10,c=18
sub. a,b and c in the formula 
x= \frac{-b+ \sqrt{ b^{2}-4ac } }{2a}, \frac{-b- \sqrt{ b^{2}-4ac } }{2a}
u can find that roots are 5- \sqrt{7},5+ \sqrt{7}
0 0 0
Split the middle term
1 1 1
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