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Which of the following quadratic polynomials has zeroes \(\frac 35 \) and \(- \frac 12\) ?

(A) \(10x^2 +x+3\)

(B) \(10x^2 +x-3\)

(C) \(10x^2 -x+3\)

(D) \(10x^2 -x-3\)

1 Answer

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Best answer

Correct option is (D) \(10x^2 -x-3\)

Here, the zeroes are \(\frac{3}{5}\) and \(\frac{-1}{2}\).

Let, \(\alpha=\frac{3}{5}\) and \(\beta=-\frac{1}{2}\)

Sum of the zeroes \((\alpha+\beta)=\frac{3}{5}+\left(-\frac{1}{2}\right)\)

\(=\frac{3}{5}-\frac{1}{2}\)

\(=\frac{6-5}{10} \)

\(=\frac{1}{10}\)

Product of the zeroes \((\alpha \beta)=\frac{3}{5} \times\left(-\frac{1}{2}\right)\)

\(=-\frac{3}{10}\)

The polynomial will be \(x^2-(\alpha+\beta) x+\alpha \beta=0\)

\( \Rightarrow x^2-\frac{1}{10} x+\left(-\frac{3}{10}\right)=0\)

\(\Rightarrow \frac{x^2}1-\frac{x}{10}-\frac{3}{10}=0\)

\(\Rightarrow \frac{10 x^2-x-3}{10}=0\)

\(\Rightarrow10 x^2-x-3=0\)

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