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QUADRATIC EQUATION
Ax²+Bx+C=0
QUADRATIC FORMULA
x=-bÂąâ(b²-4ac)/2a
SUM OF TWO ROOTS
-B/A
PRODUCT OF TWO ROOTS
C/A
BINOMIAL THEOREM USING SIGMA NOTATION
( (a + b)^n = \sum_{k=0}^{n} \binom{n}{k} a^{n-k} b^k ).
FOR A COMPLETE JOB, r=?
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