Advanced MathMediumNegative solution of a quadratic given the positive one
Advanced Math practice question
The equation x² + x = 30 has two solutions, one of which is 5. What is the other solution?
Answer: -6
x² + x − 30 = (x − 5)(x + 6), so the other solution is −6.
Common wrong answers
- If you answered 6
- 6 has the sign wrong.
- If you answered 25
- 25 is 5².
- If you answered -5
- −5 negates the given solution.
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