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