SOLUTION: Hi, I was wondering if there is a shortcut to the quadratic equation -b+ or - Sqrt of b^2 -4ac all over 2a for specific equations like primes or something like that. Thanks

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Hi, I was wondering if there is a shortcut to the quadratic equation -b+ or - Sqrt of b^2 -4ac all over 2a for specific equations like primes or something like that. Thanks      Log On


   

Question 389257: Hi,
I was wondering if there is a shortcut to the quadratic equation -b+ or - Sqrt of b^2 -4ac all over 2a for specific equations like primes or something like that. Thanks
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,         

As to 'solving' Quadratic Equations of the form y = ax^2 + bx + c

Finding x such that y = 0 can be done either by:

1)factoring (showing using quadratic formula naturally has the same results)

 ex: x^2 -2x - 3 = 0 factors to (x-3)(x+1)=0 with x = 3 or x = -1

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ x+=+%282+%2B-+4%29%2F%282%29 x-= -1 or x = 3

2) When factoring does not seem to work for us, the Quadratic formula always will