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Solving Quadratic Equations Using Square Roots  Problem 5
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
There are two circumstances in which the easiest way to solve a quadratic equation may be to square root both sides: in standard form if "b" = 0, or if you have a binomial squared, as in vertex form. If "b" = 0, you could try adding the constant to both sides, isolating the x^2 part by dividing by an "a" value if necessary, and then square rooting both sides. If you have vertex form, isolate the squared piece, then square root both sides. You'll need to do one more step to get x isolated. Be sure to include both the positive and negative square roots to get two solutions! This method is often overlooked, but with practice, it can be the easiest way to solve a quadratic equation.
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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.
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Sample Problems (14)
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Solving Quadratic Equations Using Square Roots
Problem 1 11,108 viewsSolve:
x² − 225 = 0 
Solving Quadratic Equations Using Square Roots
Problem 2 10,061 viewsSolve:
100x² − 81 = 0 
Solving Quadratic Equations Using Square Roots
Problem 3 8,341 viewsSolve:
x² + 36 = 0 
Solving Quadratic Equations Using Square Roots
Problem 4 1,475 views 
Solving Quadratic Equations Using Square Roots
Problem 5 1,312 views 
Solving Quadratic Equations Using Square Roots
Problem 6 446 views 
Solving Quadratic Equations Using Square Roots
Problem 7 521 views 
Solving Quadratic Equations Using Square Roots
Problem 8 449 views 
Solving Quadratic Equations Using Square Roots
Problem 9 403 views 
Solving Quadratic Equations Using Square Roots
Problem 10 321 views 
Solving Quadratic Equations Using Square Roots
Problem 11 362 views 
Solving Quadratic Equations Using Square Roots
Problem 12 318 views 
Solving Quadratic Equations Using Square Roots
Problem 13 307 views 
Solving Quadratic Equations Using Square Roots
Problem 14 330 views
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