Solve the polynomial inequality
posted by Jill on .
Solve the polynomial inequality and graph the solution set on a real number line. Express the solution set in interval notation.
The solution set is=
(x^2(x+1) + 4(x+1) < 0
(x+1)(x^2+4) < 0
well, x^2 + 4 is always positive, so the only way the whole thing < 0 if
x+1 < 0
x < -1
good ol' Wolfram webpage
notice where the curve is below the x-axis ?