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Check it outSolving Quadratic Equations by Factoring  Problem 9 442 views
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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Sample Problems (15)
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Solving Quadratic Equations by Factoring
Problem 1 12,615 viewsSolve by factoring:
x² + 4x = 0 
Solving Quadratic Equations by Factoring
Problem 2 9,903 viewsSolve by factoring:
x² + 2x = 15 
Solving Quadratic Equations by Factoring
Problem 3 9,165 viewsSolve by factoring:
x² + 6x + 9 = 0 
Solving Quadratic Equations by Factoring
Problem 4 8,841 viewsSolve by factoring:
3x² − 18x = 27 
Solving Quadratic Equations by Factoring
Problem 5 555 views 
Solving Quadratic Equations by Factoring
Problem 6 509 views 
Solving Quadratic Equations by Factoring
Problem 7 440 views 
Solving Quadratic Equations by Factoring
Problem 8 429 views 
Solving Quadratic Equations by Factoring
Problem 9 441 views 
Solving Quadratic Equations by Factoring
Problem 10 433 views 
Solving Quadratic Equations by Factoring
Problem 11 386 views 
Solving Quadratic Equations by Factoring
Problem 12 414 views 
Solving Quadratic Equations by Factoring
Problem 13 383 views 
Solving Quadratic Equations by Factoring
Problem 14 423 views 
Solving Quadratic Equations by Factoring
Problem 15 401 views
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