Find all the real fourth roots of 256. (Multiple Choice)

Question

a. -4 and 4
b. -8 and 8
c. 4
d. 8

Answer 1

0 = x⁴ - 256

0 = (x² - 16)(x² + 16)

0 = (x + 4)(x - 4)(x + 4i)(x - 4i)

 

{-4, 4}

 

Follow the same process for your other similar questions.