Question

Se considera expresia E(x)=(x-7) la pătrat +|4-x|.Valoarea expresiei pentru x=6 este egala cu:
A.1
B.-2
C.-3
D.3

Answer 1

x=6 => E(6)=(6-7)^2+|4-6| => E(6)=(-1)^2+|-2| => E(6) = 1 + 2 = 3 => D

Answer 2

$\text{E}(\text{x})=(\text{x}-7)^2 +|4-\text{x}| \\ \\ \text{E}(6) = (6-7)^2+|4-6| = (-1)^2+|-2| = 1+2 =3 \\ \\ \Rightarrow \boxed{\text{E}(6) = 3}$