Question

plzz Give me the correct answer and steps also plzz Give me the answer fastt​

Answer 1

Answer:

ans is 416.16 using (a^2+b^2)

Step-by-step explanation:

(20.4)^2 = (20+0.4)^2

=(20)^2 + (0.4)^2 + 2×20×0.4

{(a^2+b^2) = a^2+b^2+2ab}

=400+0.16+16

=416.16