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Solving Quadratic Equations Using Square Roots  Problem 3
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
By now when you guys see quadratic equations with no b term you’re probably ready to go ahead and taking square root to both sides.
But first I need to get the x² piece by itself before I subtract 36 from both sides. OhOh! X² equals 36. This is bad news because what I want to do it take the square root of both sides. But you guys know that there is no real square root of a negative numbers so for this square root I’m just going to write no real solutions.
That’s it, what that means is that no real number ever, ever, ever if I substitute it in there for x² and add 36 I’m never going to get 0 as my answer. So sometimes this happens in Math sometimes there’s problems where there is no real solutions. That’s it, kind of easy, you’re done.
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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.... :)”
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Sample Problems (14)
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Solving Quadratic Equations Using Square Roots
Problem 1 10,984 viewsSolve:
x² − 225 = 0 
Solving Quadratic Equations Using Square Roots
Problem 2 9,945 viewsSolve:
100x² − 81 = 0 
Solving Quadratic Equations Using Square Roots
Problem 3 8,267 viewsSolve:
x² + 36 = 0 
Solving Quadratic Equations Using Square Roots
Problem 4 1,418 views 
Solving Quadratic Equations Using Square Roots
Problem 5 1,267 views 
Solving Quadratic Equations Using Square Roots
Problem 6 401 views 
Solving Quadratic Equations Using Square Roots
Problem 7 482 views 
Solving Quadratic Equations Using Square Roots
Problem 8 412 views 
Solving Quadratic Equations Using Square Roots
Problem 9 350 views 
Solving Quadratic Equations Using Square Roots
Problem 10 290 views 
Solving Quadratic Equations Using Square Roots
Problem 11 329 views 
Solving Quadratic Equations Using Square Roots
Problem 12 280 views 
Solving Quadratic Equations Using Square Roots
Problem 13 279 views 
Solving Quadratic Equations Using Square Roots
Problem 14 295 views
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