Resposta :
x.(-1).1 + 2.x.0 + 1.3.2 - 1.(-1).0 - x.x.2 - 2.3.1 =
-x + 0 + 6 - 0 - 2x² - 6 =
-2x² - x
delta = -1² -4.(-2).0
delta = 1
x = -(-1) +- [tex] \sqrt{1} [/tex] / 2(-2) = 1 +- 1 / -4
x'= 0
x''= -1/2
det= 0.(-1).1 + 2.0.0 + 1.3.2 - 1.(-1).0 - 0.0.2 - 2.3.1 = 0
-x + 0 + 6 - 0 - 2x² - 6 =
-2x² - x
delta = -1² -4.(-2).0
delta = 1
x = -(-1) +- [tex] \sqrt{1} [/tex] / 2(-2) = 1 +- 1 / -4
x'= 0
x''= -1/2
det= 0.(-1).1 + 2.0.0 + 1.3.2 - 1.(-1).0 - 0.0.2 - 2.3.1 = 0