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Class 10MathematicsPolynomialsPolynomials in one variableExpert
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If (p(x)=x^3+ax^2+bx+20), (p(1)=0), and (p(-4)=0), what is the value of (a-b)?

Answer and explanation

Correct answer: (17)

The conditions give (a+b=-21) and (4a-b=11), so (a=-2), (b=-19), and (a-b=17). When two zeros are given, form two equations.

Related tags

ParameterZerosCubic PolynomialPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq
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