If x=9 is a solution of the equation x square - a = 0, which of the following is a solution of x 4 -a = 0?

(a) -81 (b) -3 (c) 0 (d) 9 (e) 81

please help me

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If x=9 is a solution of the equation x square - a = 0, which of the following is a solution of x 4 -a = 0?

(a) -81 (b) -3 (c) 0 (d) 9 (e) 81

please help me

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## Answers (1)

(b)

(-3)^4 = 9^2 = 81