Answer:
1. A quadratic inequality is an equation of second degree that uses an inequality sign instead of an equal sign.
2.The only exception is that, with quadratic equations, you equate the expressions to zero, but with inequalities, you're interested in knowing what's on either side of the zero i.e. negatives and positives. Quadratic equations can be solved by either the factorization method or by use of the quadratic formula
3. A quadratic inequality can be in one of the following forms: + + > 0 , + + ≥ 0 , + + < 0 , + + ≤ 0 , where , , and are constants and ≠ 0 .
4.A quadratic equation in two variables is an equation that's equivalent to an equation of the form p(x, y)=0 where p(x, y) is a quadratic polynomial.
