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Where will the zero of r(x) = 3x + 12 lie on the number line?

Answer and explanation

Correct answer: At −4

The governing concept is that a zero of a polynomial or function is an x-value for which its output is exactly zero. Set r(x)=0: 3x+12=0. Subtracting 12 from both sides gives 3x=−12, and dividing by 3 gives x=−4. Thus the zero is located at the point −4 on the number line, so option B is correct. Substitution verifies the result: r(−4)=3(−4)+12=−12+12=0. Option A results from losing the negative sign while dividing, whereas options C and D select the constant term or its negative without solving the linear equation. The zero is an input value, not simply a coefficient or constant appearing in the expression.

Related tags

PolynomialsZerosLinear-FunctionNumber-LineRepresenting Real Numbers On The Number LineMathematicsClass 10 Mcq

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