Definition: With the quadratic formula we solve the quadratic equation: { ax^2+bx+c=0} .
The formula is: x_1,x_2 = {{  b \,\pm\, \sqrt {b^2 \,\, 4 \cdot a \cdot c} } \over {2 \cdot a}}
The discriminant is: D=b^24\cdot a\cdot c (the expression inside the square root). Example 
Rules Explanation

Related topics:
 quadratic function
 Quadratic formula and complex numbers
 root of a function, xintercept
 yintercept
 linear function, polynom? (polynomial function)
 function
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