Question

Prove that for any real numbers a, b, c, & d the inequality \[\color{red}{a^4+b^4+c^4+d^4\ge 4abcd.}\]is valid.

Answer 1

I have a solution to it:)

Answer 2

Then what do you need?

Answer 3

how come he gt \[a^2b^2+c^2d^2\ge 2\sqrt{a^2b^2c^2d^2}.\]

Answer 4

\[a^2+b^2\geq 2ab\]

Answer 5

k:) i gt it:)

Answer 6

thanx:)

Answer 7

yw