Statement 1. x4(y−z)+y4(z−x)+z4(x−y) is positive if x>y>z. We have to solve this by Value putting method Here, x>y>z. Then, x=2,y=1 or z=0 Now, ⇒24(1−0)+14(0−2)+04(2−1) ⇒16+1(−2)+0 ⇒16−2=14 So, Statement 1 is positive. Statement 2. x4(y−z)+y4(z−x)+z4(x−y) is negative if x<y<z Here, x<y<z Then, x=0,y=1 or z=2 Now, ⇒04(1−2)+14(2−0)+24(0−1) ⇒0+2−16=−14 So, Statement 2 is negative. ∴ Both 1 and 2 .