Solving Quadratic Inequalities, More Examples - Example 3

[suyamaths]

Hello sir! wen we divide or multiply by a -ve number, the inqequality changes. Pl check.

[JThorss0N]

Thanks! But you have to swap the inequality sign when dividing by a negative number? That would make the solution [-8, -2].

If you think of the graph -2y^2-20y-32=0, it is a downward opening graph and if it crosses the x-axis at x=-8, and x=-2, it is greater than and equal to 0 between(and including) those points...

[zingyo92]

@JThorss0N i thought so too rite?the inequality symbol changes rite if we divide both side by -2

[kristian95]

thaaaaaaaaaaaaaaaaaaanks!!!

[clansman89]

You could also do like when you divide inequality with negative number, the sign of inequality changes from greater than or even to less than or even.

I was thought this change is obligatory or am I wrong :)

[lee0slayer]

wait you just divided by a negative number and did not flip the inequality

[TheDuskMar]

Sign Graph?