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If (p(x)=7x+a) and (q(x)=4x-12), what is (a) if the zero of (p(x)+q(x)) is (2)?

Answer and explanation

Correct answer: -10

First add the polynomials: \(p(x)+q(x)=7x+a+4x-12=11x+a-12\). Since 2 is a zero, put \(x=2\): \(22+a-12=0\). Thus \(a+10=0\), so \(a=-10\). If \(a=0\), the value of the polynomial at \(x=2\) would be 10, not zero. Exam tip: when a zero is given, substitute that value in the polynomial and set the result equal to 0.

Related tags

PolynomialsLinear PolynomialsZero Of PolynomialParameter ValueAlgebraic SubstitutionIntroduction To PolynomialsMathematicsClass 9 Mcq

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