Question

raiz da equação : x² - 5x - 14 =0

Answer 1

x² -5x -14=0

Δ =25 +56 =81      √Δ=9

x=( 5 + 9 )/2= 14/2 = 7

x= (5 -9 )/2 =-4/2= -2

S={-2,7}