1) x^2-x-1=0
D=5
x=-(√5-1)/2
x=(√5+1)/2
2) 9x^2-12x-14
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Verified answer
1) x^2-x-1=0
D=5
x=-(√5-1)/2
x=(√5+1)/2
2) 9x^2-12x-14
==================