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Decide What Values of the Variable Cannot Possibly Be Solutions $x ^ { 4 } + 720 = 89 x ^ { 2 }$

Question 301

Multiple Choice

Decide what values of the variable cannot possibly be solutions for the equation.
- $x ^ { 4 } + 720 = 89 x ^ { 2 }$

A) $\{ - 80 , - 9,9,80 \}$
B) $\{ 9,80 \}$
C) $\{ - 4 \sqrt { 5 } , - 3,3,4 \sqrt { 5 } \}$
D) $\{ 3,4 \sqrt { 5 } \}$

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