looking for tha values of x for which f(x)=g(x)

f(x)=x4-2x2  and g(x)=2x2
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2 Answers

f(x) = g(x)
x^4 - 2x^2 = 2x^2
x^4 - 2x^2 - 2x^2 = 0
x^4 - 4x^2 = 0
(x^2)(x^2 - 4) = 0
(x^2)(x + 2)(x - 2) = 0
x^2 = 0 or x + 2 = 0 or x - 2 = 0
x = 0 or x = -2 or x = 2
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