$Ifgis$ a twice differentiable function and $f(x)=xg(x^7),$ find $f^{\text{'}\text{'}}in$ terms $ofg,g^{\text{'}},$ and $g^{\text{'}\text{'}}.$

$7x^6{g}^{\text{'}}(x^7)+49x^{6}g(x^6)+42x^{4}g(x^5)$

$56x^6{g}^{\text{'}}(x^7)+49x^{13}{g}^{\text{'}\text{'}}(x^7)$

$7x^7{g}^{\text{'}\text{'}}(x^7)+49x^6{g}^{\text{'}}(x^7)+6x^6{g}^{\text{'}}(x^7)$

$1+210x^{4}g(x^7)+42x^5{g}^{\text{'}}(x^7)+7x^6{g}^{\text{'}\text{'}}(x^7)$

$x{g}^{\text{'}\text{'}}(x^7)+2g^{\text{'}}(x^7)$