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sum of roots
Source: Beat The GMAT — Problem Solving |
IF X.Y=0 => x=0 or y=0 or both=0.
Equate all fectors to zero one by one and your will get values of X, add them.
(x + 1) = 0 => x=-1.
(x − 2)=0 => x=2
(x − 3) = 0 => x=3
-1+2+3 = 4.
Equate all fectors to zero one by one and your will get values of X, add them.
(x + 1) = 0 => x=-1.
(x − 2)=0 => x=2
(x − 3) = 0 => x=3
-1+2+3 = 4.
(x + 1)(x − 2)(x − 3) = 0
each part can be zero and give us the root.
=>
(x + 1) = 0 : x=-1
(x − 2) = 0 : x=2
(x − 3) = 0 : x=3
=>
answer is 4.
each part can be zero and give us the root.
=>
(x + 1) = 0 : x=-1
(x − 2) = 0 : x=2
(x − 3) = 0 : x=3
=>
answer is 4.
