Theory
Quadractic formula
When a quadractic equation of the form ax² + bx + c = 0 cannot be
factorised, the quadractic formula can be used to solve for x :
Note: If b² - 4ac < 0 there is no solution.
Example
Solve the following equation for using the quadratic formula:
x² +3x-5=0
Solution
Recall the quadratic formula for the quadratic ax² + bx + c = 0
Therefore:
x² +3x-5=0
a=1 b=3 c=-5
Substituting values:
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