"I do not understand why we teach solving quadratic equations by factoring at all? I believe the lead up to this, namely the weeks of wasted time on factoring expressions, loses too much valuable learning time in the Algebra curriculum. I think we ought to reduce to near zero the bothersome practice of factoring, teach the quadratic formula right up front since what we hope to accomplish is a solution of the quadratic, and move on." -- @cbrownlmath
"I don't get why we teach rationalizing the denominator. It was originally introduced as a way to better estimate square roots without a calculator (Ex: it's easier to divide by 2 than divide by sqrt2). It doesn't seem like these estimations are necessary anymore, now that calculators will do this." --@veganmathbeagle
"I don't get the relevance in using point-slope form when writing equations of linear functions."
"I don't get why radicals need to be simplified in Algebra since calculators can give the approximate decimal value. "
"I don't get why we teach simplifying radicals. It does not have any reasonable applications and seems to be a waste of time for me. Calculators can do this (but that seems like it could be an answer to almost anything). I just don't understand the reasoning as to why people think it is important to include in curriculum these days." "I don't get why we teach square root multiplying, dividing properties, fractional exponent properties."
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