evaluate y2 when y is 2.5

Answer 1

y = 2.5

y2 <- Plug in 2.5 (2.5 x 2 or 2.5^2)
(y x 2)

2.5^2 = ____

Answer 2

since (a+b)^2 = a^2 + 2ab + b^2
let a=2 and b = 0.5
then 2.5^2 ≈ 2^2 + 2*2*.5 = 4+2 = 6