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If x=0 is a zero of p(x)=7x^3-2x, what is the reason?

Answer and explanation

Correct answer: Every term has factor x

The governing concept is the definition of a zero of a polynomial: a number r is a zero when p(r)=0. The polynomial can be factored as p(x)=7x^3-2x=x(7x^2-2). Thus x is a factor of every term, and substituting x=0 gives p(0)=0(7(0)^2-2)=0. Equivalently, the constant term is zero, which is why the graph passes through the origin. Option A states the direct algebraic reason. Option B is incorrect because 7 is the coefficient of x^3, not the constant term. The degree being 3 and the presence of a negative coefficient do not by themselves make zero a root. Therefore A is the only unambiguous answer.

Related tags

Zeroes Of PolynomialsFactorisationPolynomialsPolynomials In One VariableMathematicsClass 10 Mcq

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