Sunday, 19 December 2010
There are several programmes that enable the three parameters of a quadratic expression to be varied. This
seems clear and can be expanded to a whole screen.
Varying 'b' seems to trace a quadratic (with the lowest graph points). Establish that the equation is y = -1/4 b^2 when c = 0 and a = 1.
There is also a completed square
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