I need to explain how to write a function with a zero of 0.5 Work backwards from the solution: x = 0.5 {the solution x  0.5 = 0 {subtracted 0.5 from each side} (x  0.5)(x  0.5) = 0 {wrote as two binomials multiplied equal to zero} x(x) + x(0.5)  0.5(x)  0.5(0.5)= 0 {used foil method} x²  0.5x  0.5x + 0.25 = 0 {multiplied through} x²  x + 0.25 = 0 {combined like terms} A zero of a quadratic function is where the graph meets the xaxis.  Algebra House
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