16Hit1600
Advanced MathEasy–MediumSum of the solutions of a factored product

Advanced Math practice question

The equation (x + 1)(x − 3) = 5 has two solutions. What is their sum?

Answer: 2

x² − 2x − 3 = 5 gives x² − 2x − 8 = (x − 4)(x + 2) = 0, so the solutions 4 and −2 sum to 2.

Common wrong answers

If you answered 4
4 is the other solution.
If you answered -2
−2 is one solution.
If you answered -8
−8 is the product of the solutions.

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