Question

F(x1) not equal to zero f(x2) not equal to zero then f(x1+x2)

Answer 1

Hey friend...

f(x1+x2) = 0
> 0
< 0

For example,
1. If f(x1) = -2
f(x2) = 2
then f(x1+x2) = f(-2+2) = 0
means value of two function must same and opposite sign.

2. When value of two function is positive then >0

3. when value of two function is negative then <0


Hope this help u....
thanx for asking....

Answer 2

f(x1+x2) = 0

> 0

< 0

For example, If f(x1) = -2

f(x2) = 2

then f(x1+x2) = f(-2+2) = 0

means value of two function must same and opposite sign.

When value of two function is positive then >0

when value of two function is negative then <0