-> SOLUTION: 20x^2-21=-23x
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Algebra: Expressions involving variables, substitution
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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=2209 is greater than zero. That means that there are two solutions:
can be factored:
Again, the answer is: 0.6, -1.75. Here's your graph: