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Solving Quadratic Equations by Factoring  Problem 9
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
Factoring by grouping is a technique that can sometimes be used when you're factoring a polynomial with four terms. To check if factoring by grouping will work, the product of the first and last terms must equal the product of the middle two terms (be sure it's in standard form first!) If grouping will work, draw a vertical line to cut your polynomial into two halves, and then factor each half separately using greatest common factors. If grouping "works," the inside binomials will be the same on both sides. The outside gcf's will become the other binomial factor. FOIL to check your work.
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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 (22)
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Solving Quadratic Equations by Factoring
Problem 1 15,306 viewsSolve by factoring:
x² + 4x = 0 
Solving Quadratic Equations by Factoring
Problem 2 12,398 viewsSolve by factoring:
x² + 2x = 15 
Solving Quadratic Equations by Factoring
Problem 3 11,174 viewsSolve by factoring:
x² + 6x + 9 = 0 
Solving Quadratic Equations by Factoring
Problem 4 11,324 viewsSolve by factoring:
3x² − 18x = 27 
Solving Quadratic Equations by Factoring
Problem 5 1,762 views 
Solving Quadratic Equations by Factoring
Problem 6 1,734 views 
Solving Quadratic Equations by Factoring
Problem 7 1,506 views 
Solving Quadratic Equations by Factoring
Problem 8 1,437 views 
Solving Quadratic Equations by Factoring
Problem 9 1,426 views 
Solving Quadratic Equations by Factoring
Problem 10 1,467 views 
Solving Quadratic Equations by Factoring
Problem 11 1,324 views 
Solving Quadratic Equations by Factoring
Problem 12 1,408 views 
Solving Quadratic Equations by Factoring
Problem 13 1,330 views 
Solving Quadratic Equations by Factoring
Problem 14 1,532 views 
Solving Quadratic Equations by Factoring
Problem 15 1,328 views 
Solving Quadratic Equations by Factoring
Problem 16 688 views 
Solving Quadratic Equations by Factoring
Problem 17 706 views 
Solving Quadratic Equations by Factoring
Problem 18 602 views 
Solving Quadratic Equations by Factoring
Problem 19 655 views 
Solving Quadratic Equations by Factoring
Problem 20 651 views 
Solving Quadratic Equations by Factoring
Problem 21 655 views 
Solving Quadratic Equations by Factoring
Problem 22 647 views
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