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`        inequality like (a+1)(a+4)>0 the answer is(-ihfinity,-1)U (4,infinity) but when i try to solve this i came to a>-1,a>4 please explain what is the problem in my soilution  and how to solve these inequlities `
7 years ago

419 Points
```										Dear Aditya
these type of inequalities are solved using wavy curve method. first find the critical points;i.e. points where function is zero. then place these points on number line
like this           + -1_____--__________ +4  +
start from the extreme right point that is the greatest  number place a + sign after this  then place a negative sign between this number and previous number on left side. then place a + sign . keep doing this. hence function is negative between -1 and 4 and positive besides this range.
hence answer will be (-∞,-1) U (4,∞)

All the best.
AKASH GOYAL

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7 years ago
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