SOLUTION: Why do you factor a quadratic equation before you solve?
Quadratic Equations and Parabolas
-> SOLUTION: Why do you factor a quadratic equation before you solve?
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Why do you factor a quadratic equation before you solve?
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You do not have to factor a quadratic equation before you solve it.
You can solve it using a discriminant.
SOLVE quadratic equation with variable
(in our case
) has the following solutons:
For these solutions to exist, the
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:
can be factored:
Again, the answer is: 3, -1. Here's your graph: