If sum of the two numbers is-9 and their product is-36, then the numbers are:
Correct answer: B. -12, 3
- A. 12, -3
- B. -12, 3
- C. -12, -3
- D. 9, -4
Explanation
Instead of forming two simultaneous equations (a + b = -3 & ab = -36) and solving them, it is often advantageous and time efficient to quickly scan the answers and see which ones fit the given requirements. In this case, only answer B meets the initial condition that a+b = -3 and 3x-12 = -36 too, so B is the correct answer.
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