Solve the Equation by Making an Appropriate Substitution $\mathrm { x } ^ { 1 / 2 } - 10 \mathrm { x } ^ { 1 / 4 } + 21 = 0$

question 55

Multiple Choice

Solve the equation by making an appropriate substitution.
- $\mathrm { x } ^ { 1 / 2 } - 10 \mathrm { x } ^ { 1 / 4 } + 21 = 0$

• A) \(\{ 81,2401 \}\)
• B) \(\{ 9,49 \}\)
• C) \(\{ - 3 , - 7 \}\)
• D) \(\{ 3,7 \}\)

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