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

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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