Question

x elevado a 2 mais 12x menos 13 igual a zero

Answer 1

Olá.
x² + 12x - 13 = 0
a = 1
b = 12
c = - 13
Achando Delta
Δ=b² - 4.a.c
Δ=12² - 4.1.13
Δ = 144 + 52
Δ=196

Achando Bhaskara
x=(-b+-√Δ)/2a

x'=-12+√196/2.1
x' = - 12 + 14/2
x'= 2/2
x' = 1

x"=-12-√196/2.1
x"=-12-14/2
x"=-26/2
x"=-13

S = { x'=1 e x"=-13}

Espero ter ajudado.