Question

${a}^{4 } - a {}^{2} + 16$
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Answer 1

Step-by-step explanation:

${a}^{4 } - {a}^{2} + 16 \\ = > {a}^{2} + 16 = 0 \\ = > {a}^{2} = - 16 \\ = > a = \sqrt{ - 16} \\ = > a = 4$

Answer 2

Answer:

${a}^{4} - {a}^{2} + 16 \\ {a}^{2} + 16 = 0 \\ {a}^{2} = - 16 \\ a = 4$