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WE CAN UNDERSTAND WAVY CURVE METHOD BY THE FOLLOWING EXAMPLE :
LET THE EQUATION BE (x-a)(x-b)(x-c) > 0
(x-e)(x-f)(x-g)
IN THE GIVENN QUESTION WE ARE ASSUMING THAT a,b,c ARE LESS THAN ZERO.
FURTHER WE ASSUME THAT g>f>e>0>c>b>a
- + - + - + - +
a b c 0 e f g
HENCE THE SOLUTION WILL BE
X BELONGS TO (A,B)U(C,0)U(E,F)U(G,∞)
APPROVE THE ANSWER IF HELPFUL.
THIS IS HOW WE ASSIGN - OR + SIGN WHILE DECIDING THE SIGN SCHEME.
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