Asked by Anne S.
SOlve the following inequalities:
1. x^2-x-6 greater than equal to zero
2. x^3+5x^2-4x-20 > 0
1. x^2-x-6 greater than equal to zero
2. x^3+5x^2-4x-20 > 0
Answers
Answered by
Steve
just solve as for equations. If you find the roots, then
for the parabola, y>=0 outside the interval containing the roots.
For the cubic, you know y<0 where x is less than the smallest root.
y>0 between the 1st and 2nd roots,
y<0 between the 2nd and 3rd roots
y>0 where x is greater than the 3rd root.
for the parabola, y>=0 outside the interval containing the roots.
For the cubic, you know y<0 where x is less than the smallest root.
y>0 between the 1st and 2nd roots,
y<0 between the 2nd and 3rd roots
y>0 where x is greater than the 3rd root.
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