"Dear Henri,
Your slide show deriving the quadratic formula graphically is masterful,
so nicely explained.
— Zalman Usiskin"
Same slide show, without the audio
(Enter any name. Click ► ️to play. Use arrow keys to advance through it.)
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Henri Picciotto's Math Education Page
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Henri Picciotto
"Dear Henri,
Your slide show deriving the quadratic formula graphically is masterful,
so nicely explained.
— Zalman Usiskin"
Same slide show, without the audio
(Enter any name. Click ► ️to play. Use arrow keys to advance through it.)