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If (p(x)=6x+a) and (q(x)=3x-10), what is (a) if the zero of (p(x)+q(x)) is (2)?

Answer and explanation

Correct answer: -8

First add the polynomials: \(p(x)+q(x)=6x+a+3x-10=9x+a-10\). Since 2 is a zero, the value of this polynomial at \(x=2\) must be zero. Thus, \(9(2)+a-10=0\), or \(18+a-10=0\), which gives \(a=-8\). If \(a=-6\), the value at \(x=2\) is 2, not zero. Exam tip: when a zero is given, substitute it into the polynomial and equate the result to \(0\).

Related tags

PolynomialsLinear PolynomialsZero Of PolynomialParameter ValueAlgebraic SubstitutionIntroduction To PolynomialsMathematicsClass 9 Mcq

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