If x=9 is a solution of the equation x² -a=0, which of the following is a solution of x^4 - a=0? A: -81 B: -3 C: 0 D: 9 E: 81

asked Aug 6, 2018 63.9k views

2 votes

If x=9 is a solution of the equation x² -a=0, which of the following is a solution of x^4 - a=0?

A: -81
B: -3
C: 0
D: 9
E: 81

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2 votes

x² - a = 0. If x = 9, then:

9² - a = 0 or 81 =a
So a= 81(E)

Mahdi Aryayi answered Aug 10, 2018

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