Question

Please answer this step by step.

Answer 1

(x-1)^2 + (y-3)^2 + (z-5)^2 + (t-7)^2 =0

=> (x-1)^2 =0 => x=1

    (y-3)^2=0 => y=3

    (z-5)^2=0 => z=5

    (t-7)^2 =0 => t=7

thus xyzt+16 =1.3.5.7+16= 121 => D