For what values of x
does
plus(XX, (A+B)+X) < -C
R1
< x <
R2
First, move the term over to the other side of the inequalityplus(XX, (A+B)+X, C) < 0
Now, let's factor the quadratic equationmult(LEFT, RIGHT) < 0
either LEFT < 0
and RIGHT > 0
or
LEFT > 0
and RIGHT < 0
either X < -A
and X > -B
or
X > -A
and X < -B
which we can graph, like so:
By plugging in a value for x
we can see which of the inequalities fits