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If p(x)=x^4-1, how many real zeroes are there besides x=1 and x=-1?

Answer and explanation

Correct answer: 0

The governing concept is factorisation and the distinction between real and non-real zeroes. Factor the polynomial as x^4-1=(x^2-1)(x^2+1)=(x-1)(x+1)(x^2+1). The first two factors provide the known real zeroes x=1 and x=-1. For every real number x, x^2 is non-negative, so x^2+1 is at least 1 and can never be zero. Its formal solutions are x=i and x=-i, which are non-real and must not be counted. Therefore there are no real zeroes beyond the two given ones, so option A is correct. Options B, C, and D result from failing to factor completely or from counting complex roots as real roots.

Related tags

Real ZeroesFactorisationPolynomialsGeometrical Meaning Of The Zeroes Of A Polynomial.Geometrical Meaning Of The Zeroes Of A PolynomialMathematicsClass 10 Mcq

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