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Figure 1. Plots of quadratic function y = ax 2 + bx + c, varying each coefficient separately while the other coefficients are fixed (at values a = 1, b = 0, c = 0). A quadratic equation whose coefficients are real numbers can have either zero, one, or two distinct real-valued solutions, also called roots.
Square number 16 as sum of gnomons.. In mathematics, a square number or perfect square is an integer that is the square of an integer; [1] in other words, it is the product of some integer with itself.
Spencer Bonaventure Tracy (April 5, 1900 – June 10, 1967) was an American actor. He was known for his natural performing style and versatility. One of the major stars of Hollywood's Golden Age, Tracy was the first actor to win two consecutive Academy Awards for Best Actor, from nine nominations.