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

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) (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
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