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Solving Quadratic Equations by Factoring  Problem 15
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
Technically, we're allowed to do anything to an equation as long as we do it to both sides of an equation. This includes dividing: we could divide by a number (or constant) or even divide by a variable, BUT... in dividing by a variable, though it is technically mathematically correct, we would lose a solution to a quadratic equation. As shown here, the best method is always to set the equation equal to zero, factor, and then solve using the zero product property rather than divide by a variable.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
Sample Problems (22)
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Solving Quadratic Equations by Factoring
Problem 1 14,583 viewsSolve by factoring:
x² + 4x = 0 
Solving Quadratic Equations by Factoring
Problem 2 11,817 viewsSolve by factoring:
x² + 2x = 15 
Solving Quadratic Equations by Factoring
Problem 3 10,677 viewsSolve by factoring:
x² + 6x + 9 = 0 
Solving Quadratic Equations by Factoring
Problem 4 10,644 viewsSolve by factoring:
3x² − 18x = 27 
Solving Quadratic Equations by Factoring
Problem 5 1,416 views 
Solving Quadratic Equations by Factoring
Problem 6 1,420 views 
Solving Quadratic Equations by Factoring
Problem 7 1,233 views 
Solving Quadratic Equations by Factoring
Problem 8 1,199 views 
Solving Quadratic Equations by Factoring
Problem 9 1,194 views 
Solving Quadratic Equations by Factoring
Problem 10 1,231 views 
Solving Quadratic Equations by Factoring
Problem 11 1,108 views 
Solving Quadratic Equations by Factoring
Problem 12 1,115 views 
Solving Quadratic Equations by Factoring
Problem 13 1,108 views 
Solving Quadratic Equations by Factoring
Problem 14 1,251 views 
Solving Quadratic Equations by Factoring
Problem 15 1,057 views 
Solving Quadratic Equations by Factoring
Problem 16 436 views 
Solving Quadratic Equations by Factoring
Problem 17 461 views 
Solving Quadratic Equations by Factoring
Problem 18 405 views 
Solving Quadratic Equations by Factoring
Problem 19 454 views 
Solving Quadratic Equations by Factoring
Problem 20 431 views 
Solving Quadratic Equations by Factoring
Problem 21 427 views 
Solving Quadratic Equations by Factoring
Problem 22 363 views
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