Question 4
Fractions, Decimals and Approximation(3.2)2 − (1.8)2 equals
- A.7.0
- B.2.56
- C.13.48
- D.2.0
- E.0.07.
Show the answer and explanation
Answer: A (7.0)
Explanation
Use the difference of two squares: (3.2 + 1.8)(3.2 − 1.8) = 5 × 1.4 = 7.0.
(3.2)2 − (1.8)2 equals
Answer: A (7.0)
Use the difference of two squares: (3.2 + 1.8)(3.2 − 1.8) = 5 × 1.4 = 7.0.