Solve the question of Solving Questions and select the option from the choices A through D/E. Check your Answer and view the explanation.
Question: 1
| Column A |
Column B |
| ab = - 40 |
| (a + b )2 | (a - b )2 |
- A if the quantity in Column A is greater.
- B if the quantity in Column B is greater.
- C if the two quantities are equal.
- D if the relationship cannot be determined from the information given.
Show/Hide Explanation
Correct Answer: B
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Did you memorize the expanded forms of these two expressions: (a + b)2 = a2 + 2ab + b2 and (a – b)2 = a2 – 2ab + b2? Now cancel the quantities that are identical in both columns by slashing off a2 and b2. You’re
left with +2ab, which would be –80, compared to –2ab, which would be +80 (because a negative
times a negative is a positive). Correct Answer: B.