A function of the form y = ax² + bx + c, where a ≠ 0, so that the highest power of x appearing is its square. The quadratic equation ax² + bx + c = 0 can always be solved by use of the formula 0198607679.quadratic.1.jpg These roots are real and distinct if b² >4ac, real and equal if b² = 4ac, and complex if b² < 4ac. The graph of a quadratic function is a parabola. A quadratic with a > 0 always has a minimum where x = -b/2a, and a quadratic with a < 0 always has a maximum where x = -b/2a.

• international payments
• international reserves
• International Settlements, Bank for
• international trade
• International Trade Classification, Standard
• international transactions
• interpersonal comparisons
• interpolation
• Interstate Commerce Commission
• intertemporal budget constraint
• intertemporal substitution
• interval, confidence
• intervention in foreign exchange markets
• intervention, intra-marginal
• intra-industry trade
• intra-marginal intervention
• intra-marginal intervention in foreign exchange markets
• intrapreneur
• invention
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• inverse function
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• investment income