SOLUTION: Find the real roots of f(x)=x^4-16

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Question 549818: Find the real roots of f(x)=x^4-16
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
f(x) = x^4-16


0 = x^4-16


x^4-16 = 0


(x^2-4)(x^2+4) = 0


(x-2)(x+2)(x^2+4) = 0


x-2=0, x+2=0, or x^2+4=0


x=2, x=-2, x=2i, or x=-2i


So the real roots are 2 and -2