For standard form I got but I should have got according to the vertex formula: -b/2a
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Originally Posted by Isimbot For standard form I got but I should have got Mr F says: No, see below. according to the vertex formula: -b/2a has a vertex at x = h. Your vertex formula told you that x = -8/2 = -4 therefore h = -4 which agrees with your earlier (correct) calculation.
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