Question 566930
How'd you get x=20 from x^2 - x = 20?


You should also subtract the 20, so your equation will look something like


*[tex \LARGE x^2 - x - 20 = 0], this factors to


*[tex \LARGE (x-5)(x+4) = 0], so x = 5 or x = -4. Since we have a square root, we should check to make sure our solutions actually work. x = 5 definitely works, x = -4 probably won't since the square root usually denotes only the positive root. The solution 13/12 is wrong.