Question

Prove ab+bc+cd+da>ac+bd

Answer 1

Step-by-step explanation:

ab+bc+cd+da>ac+bd

let, a=1

b=2

c=3

d=4

now ,

ab+bc+cd+da>ac+bd

1×2+2×3+3×4+4×1>1×3+2×4

2+6+12+4>3+8

24>11

Hence,

ab+bc+cd+da>ac+bd