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$2x^{2}+3x+a=0$ $35$ $2$ $a$

$3x^{2}-αx+a=0$

$a5x-2x+x=15$

$\dfrac {\dfrac {Dxxx=} {2\right)x+a=}} {2\right)xy\times 2\times =}$ $4\right)$ $a\times b=$

The equation whose roots are the reciprocals with sign changed of the roots of the equation a. $x^{2}+2bx+c=0$ $1s$ $1\right)cx^{2}+2bx+a=0$ $2\right)$ $cx^{2}-bx+a=0$ $3\right)$ $cx^{2}-2bx+a=0$ $4\right)$ $cx^{2}+bx+a=0$ $\left(2k+1\right)x^{2}-\left(7k+3\right)x+k+2=0$ has roots which are reciprocals of each other, then $k=$