SOLUTION: what are all the real zeros of f(x)=x^4-5x^2+4 ? and can you please show me how to work this problem out step by step ?

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Question 248334: what are all the real zeros of f(x)=x^4-5x^2+4 ? and can you please show me how to work this problem out step by step ?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
x^4-5x^2+4=0 This is a quadratic
(x^2-4)(x^2-1)=0
(x+2)(x-2)(x+1)(x-1)=0
x=2, x=-2, x=1, x=-1 The zeros.
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Ed