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What is true of an equation if its discriminant is zero?
it has one real solution
What does a solution with all real numbers look like?
A solution with all real numbers indicates that the equation or inequality has no restrictions on its values, meaning any real number can satisfy it. Graphically, this is often represented as a horizontal line on a number line or as a shaded region extending infinitely in both directions. For example, the equation (x = x) or the inequality (x > -\infty) includes every possible real number as a solution. Essentially, it signifies that the solution set is the entire continuum of real numbers.
What is the result if the equation has a solution that is all real numbers?
The result is all real numbers.
Why would any solution to a quadriac equation not be used in real life?
Because there is no such thing as a quadriac equation and so there cannot be a solution to it and so there is nothing that could have been used in real life!
2y equals -4x - 5?
This is an equation of a straight line. A solution for two unknowns requires two (independent) equations; there is only one here. Every point that is on that line is a solution to the equation. So you can let x be any real number and find a corresponding y. This ordered pair (x,y) will be a solution to the equation as well as a point on the graph of the line.
