Question

2º a seguir: x2 - 11x - 12 = 0

Answer 1

x² - 11x -12 = 0 { A= +1  B= -11  C= -12

Δ= b²-4ac

Δ= (-11)² - 4. (+1) . (-12)

Δ= 121 + 48

Δ= 169

X= -b ± √Δ / 2a

x= -(-11) ± √169 / 2. ( 1 )

x= 11 ± 13 / 2

x¹= 11+13 / 2

x¹= 24 / 2

x¹= 12

x²= 11 - 13 / 2

x²= -2 / 2

x²= -1

S={ -1, 12 }