Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: Rs.

There are no items in this cart.
Continue Shopping
aditya bhardwaj Grade: 11
        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

Answers : (1)

AKASH GOYAL AskiitiansExpert-IITD
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.




Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..

7 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete AIPMT/AIIMS Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!! Click Here for details