Solve the Equation by Making an Appropriate Substitution $\left( y - \frac { 15 } { y } \right) ^ { 2 } - 12 \left( y - \frac { 15 } { y } \right) - 28 = 0$

question 302

Multiple Choice

Solve the equation by making an appropriate substitution.
- $\left( y - \frac { 15 } { y } \right) ^ { 2 } - 12 \left( y - \frac { 15 } { y } \right) - 28 = 0$

• A) \(\{ - 5 , - 1,3,15 \}\)
• B) no solution
• C) \(\{ - 5,3 \}\)
• D) \(\{ - 2,14 \}\)

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