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The Quadratic Formula - Problem 4

Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

Many students think of decimals as exact. More decimal places is even more exact. BUT, this is actually not the case. When the solution to a math problem is irrational, meaning a non-terminating, non-repeating decimal, and you "round to the nearest tenths or hundredths," you are actually making the solution less precise. The most exact answer is always either a fraction, if possible, or a simplified radical. Here we look at an example of decimal approximations versus simple radical form in the context of solving a quadratic equation.

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