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Line 98: If the quadratic function is in factored form :<math>f(x) = a(x - r_1)(x - r_2)</math> the average of the two roots, ~~that is~~i.e., : <math>\frac{r_1 + r_2}{2}</math> is the {{math\|''x''}}-coordinate of the vertex, and hence the vertex {{math\|(''h'', ''k'')}} is

Quadratic function: Difference between revisions