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If the zero of (p(x)=(c+4)x+2c) is (-1), what is the correct value of (c)?

Answer and explanation

Correct answer: \(c=4\)

If \(-1\) is a zero of the polynomial, then \(p(-1)=0\). Thus, \((c+4)(-1)+2c=0\), or \(-c-4+2c=0\). Hence, \(c-4=0\), giving \(c=4\). If \(c=-4\), the polynomial becomes \(-8\), which has no zero. Exam tip: When a zero is given, substitute it into the polynomial and set the result equal to zero.

Related tags

PolynomialsLinear PolynomialsZero Of PolynomialParameterAlgebraIntroduction To PolynomialsMathematicsClass 9 Mcq

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