If you need to solve an equation with two roots that are added or subtracted, your first goal is to get them on opposite sides of the equals sign. From there, you'll need to square both sides, being very careful with expanding with FOIL. You might have to square both sides a second time, as in this example, to get rid of all of the square roots. Once you have solved for x, you'll need to check the solution(s) to make sure they're not outside the domain.
Experience the 'A-Ha!' moment with the best teachers
whom we hand-picked for you!
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.
“Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
“Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
“You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”