Evaluate: \(\dfrac{3.8^2 - 1.2^2}{3.8 - 1.2}\)
Answer: D
\(a^2 - b^2 = (a - b)(a + b)\) \(\dfrac{3.8^2 - 1.2^2}{3.8 - 1.2} \\~\\= \dfrac{(3.8 + 1.2)(3.8 - 1.2)}{(3.8 - 1.2)}\\~\\ = 3.8 + 1.2 \\~\\= 5\)