Solve Equations That Are Quadratic in Form
Solve the Equation $y = x ^ { 4 } - 20 x ^ { 2 } + 64$

Multiple Choice

Solve Equations That Are Quadratic in Form
Solve the equation by making an appropriate substitution.
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A) $y = x ^ { 4 } - 20 x ^ { 2 } + 64$
B) $y = x ^ { 4 } + 20 x ^ { 2 } + 64$
C) $y = x ^ { 4 } - 20 x ^ { 2 } + 8$
D) $y = x ^ { 4 } + 20 x ^ { 2 } - 8$