5x²-9x-2=0
a=5;b=-9;c=-2
D=b²-4ac=(-9)²-4*5*(-2)=81+40=121
x1=(-b-√D)/(2a)=(-(-9-√121))/(2*5)=(9-11)/10=-2/10=-1/5
x2=(-b+√D)/(2a)=(-(-9+√121))/(2*5)=(9+11)/10=20/10=2
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5x²-9x-2=0
a=5;b=-9;c=-2
D=b²-4ac=(-9)²-4*5*(-2)=81+40=121
x1=(-b-√D)/(2a)=(-(-9-√121))/(2*5)=(9-11)/10=-2/10=-1/5
x2=(-b+√D)/(2a)=(-(-9+√121))/(2*5)=(9+11)/10=20/10=2