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.

• industry demand for labour
• industry supply curve
• inefficiency
• inelastic
• inelastic demand
• inelastic supply
• inequality
• inequality of incomes
• infant industry
• inferior good
• infinitesimal
• infinity
• inflation
• inflation accounting
• inflation-adjusted budget deficit
• inflationary gap
• inflationary spiral
• inflation tax
• inflection, point of
• inflow, capital
• information
• information agreement
• infrastructure
• inheritance tax
• initial conditions