Pls tell question no 12,13,24,25,26,27,28

Q.12 If $\mathrm{\alpha } \mathrm{and} \mathrm{\beta }$ are the zeroes Of the polynomial $\mathrm{p}\left(\mathrm{x}\right)={\mathrm{x}}^2-\mathrm{a}\left(\mathrm{x}+1\right)-\mathrm{b} \mathrm{such} \mathrm{that} \left(\mathrm{\alpha }+1\right)\left(\mathrm{\beta }+1\right)=0$ then find value Of b. .

$\mathrm{Q} 13. \mathrm{If} \mathrm{\alpha } \& \mathrm{\beta } \mathrm{are} \mathrm{the} \mathrm{zeros} \mathrm{of} \mathrm{the} \mathrm{poynomial} {\mathrm{x}}^2-\left(\mathrm{k}+6\right)\mathrm{x}+2\left(2\mathrm{k}-1\right). \mathrm{Find} \mathrm{k} \mathrm{if} \mathrm{\alpha }+\mathrm{\beta }=1/2\mathrm{\alpha \beta }$
Q. 14. If (x+p) is a factor of the polynomial 2x²+2px+5x+10 find p