Exercise ID366

Algebra → Quadratic equations, inequalities and systems of equations → Quadratic inequalities
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Solve the following inequality on the set of real numbers!

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x2-x-2=0 a=1, b=-1, c=-2 x1,2=--1±-12-4·1·-22·1 x1,2=1±1+82 x1,2=1±92 x1,2=1±32 x1=1+32 ; x2=1-32 x1=2 ; x2=-1 a=1 x-1,2
x-1,2

x1,2=-b±b2-4ac2a ; ax2+bx+c=0

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