How to find vertex in quadratic equation
Forget formulas! Graph it and the highest or lowest point is your vertex. Works every time.
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From experience: calculating x = -b/(2a) and then plugging that back into the original equation for y has never failed me.
Just use the vertex formula: x = -b/(2a). Once you have x, plug it back into the equation to find y. Voil脿, you got your vertex (x, y)!
Multiply -1, divide by 2, and plug it into the original equation. Easy peasy!
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