SOLUTION: x^2-2x-3=0

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Question 257273: x^2-2x-3=0

Answer by CharlesG2(834)   (Show Source): You can put this solution on YOUR website!
x^2-2x-3=0
(x-3)(x+1)=0 (using foil , first outer inner last)
x^2+x-3x-3=0 (you get same equation)
x=3 or x=-1
using quadratic formula:

where a=1, b=-2, c=-3
Solved by pluggable solver: SOLVE quadratic equation with variable
Quadratic equation (in our case ) has the following solutons:



For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=16 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 3, -1. Here's your graph:


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