Resposta :
x² + x - 56 = 0
Resolvendo por Báskara:
x = (-b + - raiz delta)/2a
delta = b^2 - 4.a.c = (1)^2 - 4(1)(-56) = 1 + 224 = 225
raiz delta = + - 15
x = (- 1 + 15)/2 x1 = 7
x = (- 1 - 15)/2 x2 = - 8
S = {-8, 7}
x² + x - 56 = 0
Por Bhaskara
x = -b +/- raiz b² - 4.a.c
2.a
x= (-1) +/- raiz 1² - 4.1.(-56)
2.1
x= -1 +/- 1 + raiz 225
2
x= -1 +/- 15
2
x' = -1 + 15
2
x' = 14
2
x' = 7
x" = -1-15
2
x" = -16
2
x" = -8