Math, asked by jahangirhusain14, 26 days ago

40. If the roots of the quadratic equation 2kx2- 3kx + k + 1 = 0 are equal, then find K.
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Answers

Answered by MaheswariS
2

\textbf{Given:}

\mathsf{Roots\;of\;2kx^2-3kx+k+1=0\;are\;equal}

\textbf{To find:}

\textsf{The value of k}

\textbf{Solution:}

\mathsf{Since\;the\;roots\;of\;2kx^2-3kx+k+1=0\;are\;equal,\;we\;have}

\mathsf{b^2-4ac=0}

\implies\mathsf{(-3k)^2-4{\times}2k{\times}(k+1)=0}

\implies\mathsf{9k^2-8k{\times}(k+1)=0}

\implies\mathsf{9k^2-8k^2-8k=0}

\implies\mathsf{k^2-8k=0}

\implies\mathsf{k(k-8)=0}

\implies\mathsf{k=0,8}

\mathsf{But\;k\;cannot\;be\;zero}

\implies\boxed{\mathsf{k=8}}

\textbf{Find more:}

If the equation 16x2+6kx+4=0 has equal root then what is the value of k

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