Learn math, science, English SAT & ACT from
highquaility study
videos by expert teachers
Thank you for watching the preview.
To unlock all 5,300 videos, start your free trial.
Solving Quadratic Equations by Factoring  Problem 12
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
We can use algebra techniques to solve geometry problems here we look at one problem about the area of a rectangle, and another about finding the side lengths of a right triangle. Areas often involve the product of two or more numbers, so if you're multiplying two or more x's, you're likely to need to use factoring. Make sure you get your equation rewritten in standard form (equal to zero) before you factor. Then use the zero product property to solve for x. If you get two answers, there's a good possibility that one of the answers will not make sense in geometry problem context (for example, you couldn't have an x answer that makes one of your side lengths negative.) If this happens, that answer is just not one of your solutions. For the Pythagorean Theorem, make sure you FOIL to square each side properly. Again, write it in standard form, solve using factoring and the zero product property, and make sure your final x answers make sense.
Transcript Coming Soon!
Please enter your name.
Are you sure you want to delete this comment?
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)
Need help with a problem?
Watch expert teachers solve similar problems.

Solving Quadratic Equations by Factoring
Problem 1 15,787 viewsSolve by factoring:
x² + 4x = 0 
Solving Quadratic Equations by Factoring
Problem 2 12,787 viewsSolve by factoring:
x² + 2x = 15 
Solving Quadratic Equations by Factoring
Problem 3 11,498 viewsSolve by factoring:
x² + 6x + 9 = 0 
Solving Quadratic Equations by Factoring
Problem 4 11,816 viewsSolve by factoring:
3x² − 18x = 27 
Solving Quadratic Equations by Factoring
Problem 5 2,000 views 
Solving Quadratic Equations by Factoring
Problem 6 1,982 views 
Solving Quadratic Equations by Factoring
Problem 7 1,722 views 
Solving Quadratic Equations by Factoring
Problem 8 1,656 views 
Solving Quadratic Equations by Factoring
Problem 9 1,625 views 
Solving Quadratic Equations by Factoring
Problem 10 1,687 views 
Solving Quadratic Equations by Factoring
Problem 11 1,524 views 
Solving Quadratic Equations by Factoring
Problem 12 1,664 views 
Solving Quadratic Equations by Factoring
Problem 13 1,529 views 
Solving Quadratic Equations by Factoring
Problem 14 1,786 views 
Solving Quadratic Equations by Factoring
Problem 15 1,528 views 
Solving Quadratic Equations by Factoring
Problem 16 897 views 
Solving Quadratic Equations by Factoring
Problem 17 899 views 
Solving Quadratic Equations by Factoring
Problem 18 796 views 
Solving Quadratic Equations by Factoring
Problem 19 871 views 
Solving Quadratic Equations by Factoring
Problem 20 830 views 
Solving Quadratic Equations by Factoring
Problem 21 860 views 
Solving Quadratic Equations by Factoring
Problem 22 868 views
Comments (0)
Please Sign in or Sign up to add your comment.
·
Delete