Neither -75> 15x nor 75< -15x is correct. You change the direction of the inequality when multiplying by a negative number, but it does NOT follow that "-x" is a negative number or that "x" is a positive number; that depends upon x.Hi, can someone tell me when should i change my sign when i have such a problem?
-(75/x) > 15
i find that if -75/x > 15
i could do :
-75 > 15x
-5 > x
x < -5.
or 75/-x > 15
i could do :
75 < -15x
-5 > x
which the answer in the book says -5 < x < 0
Thanks.