Question 53
HardOriginal questionWhich equation has roots that are the reciprocals of the roots of ?
Show the answer and explanation
CorrectNot quiteAnswer C
Correct answer: C
Explanation
, so its roots are and 3.
The reciprocals are 2 and : sum , product .
Equation: , i.e. .
Worth noting
Shortcut: reversing the coefficients of to gives the reciprocal roots. Changing the signs instead gives the NEGATIVES of the roots.
- Concept
- Transforming roots: reciprocal roots by reversing coefficients
- Typical timeTypical
- 120 s
- Your timeYours
- —
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