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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.
Sample Problems (14)
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Solving Quadratic Equations Using Square Roots
Problem 1 12,243 viewsSolve:
x² − 225 = 0 
Solving Quadratic Equations Using Square Roots
Problem 2 11,128 viewsSolve:
100x² − 81 = 0 
Solving Quadratic Equations Using Square Roots
Problem 3 9,167 viewsSolve:
x² + 36 = 0 
Solving Quadratic Equations Using Square Roots
Problem 4 2,090 views 
Solving Quadratic Equations Using Square Roots
Problem 5 1,937 views 
Solving Quadratic Equations Using Square Roots
Problem 6 864 views 
Solving Quadratic Equations Using Square Roots
Problem 7 1,023 views 
Solving Quadratic Equations Using Square Roots
Problem 8 936 views 
Solving Quadratic Equations Using Square Roots
Problem 9 996 views 
Solving Quadratic Equations Using Square Roots
Problem 10 729 views 
Solving Quadratic Equations Using Square Roots
Problem 11 780 views 
Solving Quadratic Equations Using Square Roots
Problem 12 718 views 
Solving Quadratic Equations Using Square Roots
Problem 13 702 views 
Solving Quadratic Equations Using Square Roots
Problem 14 837 views
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