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Discussion

Evaluate: \(\dfrac{3.8^2 - 1.2^2}{3.8 - 1.2}\)

  • A.5.2
  • B.4.8
  • C.4
  • D.5

Answer: D

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

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