Question

if a^4+b^4+c^4+d^4=4abcd proved that a=b=c=d

Answer 1

Haiii

Here is ur answer

a⁴, b⁴ , c⁴ and d⁴ all are positive so,

a⁴ + b⁴ + c⁴ + d⁴ ≥ 4abcd

Therefore, given that

a⁴ + b⁴ + c⁴ + d⁴ = 4abcd

Hence,

a = b = c = d

Hope it helps U