Question

Найти корни x²+3x-28

Answer 1

D=$b^{2}$-4ac=9-4×1×(-28)=9+112=121

x1=$frac{-3+sqrt{121}} {2}$=$frac{8}{2}$=4

x2=$frac{-3-sqrt{121}} {2}$=$frac{-14}{2}$=-7