Question 329290
{{{ D=b^2-4ac }}}
{{{D=(-1)^2-4(10)(7)}}}
{{{D=1-280}}}
{{{D=-279}}}
Since the discriminant is negative, the roots are complex.
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Graphical verification, the curve never crosses the x-axis, hence complex roots.
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{{{graph(300,300,-10,10,-5,15,10x^2-x+7)}}}