Question

http://assets.openstudy.com/updates/attachments/51e0d121e4b0d9a104db8db9-bhusal-1373688124646-1.jpg

Answer 1

i hope this helps, let me know if u dont understand my working

Answer 2

thats because part of the graph that is under the x-axis is the part which satisfies x2-3x-10<0 so the values of x for which this occurs is -2<x<5.... do u get what i mean>

Answer 3

you cant say that (x+2)<0 because it can be greater than 0 and have (x-5)<0 instead

so either (x-5)<0 or (x+2)<0 not both, so u dont know which one shud be satisfied with out looking at the graph

Answer 4

Thankyou @Tushara