Question

aplique a formula de bhaskara na equaçao x²-2x-3=0

Answer 1

USA A FÓRMULA

DELTA= (-2)^2 - 4.1.(-3)

DELTA= 4 + 12

DELTA= 16

X1= -(-2)+ RAIZ DE DELTA / 2.1 X2= -(-2) - RAIZ DE DELTA / 2.1

X1= 2+4/2 X2= 2 - 4 / 2

X1= 3 X2= -1

ENTÃO TEMOS DUAS RAÍZES QUE SÃO 3 E -1

Answer 2

.

${x}^{2} - 2x - 3 = 0 \\ a = 1 \\ b = - 2 \\ c = - 3$
∆ = b² - 4ac
∆ =(-2)² - 4×1×(-3)
∆ = 4+12
∆ = 16

$x1 = \frac{- b + \sqrt{Δ}}{2 \times a} \\ x 1= \frac{ - ( - 2) + \sqrt{16}}{2 \times 1} \\ x1 = \frac{2 + 4}{2} \\ x1 = \frac{6}{2} \\ x1 = 3$

$x2 = \frac{ - b - \sqrt{Δ}}{2 \times a} \\ \\ x2 = \frac{ -( - 2) - \sqrt{16} }{2 \times 1} \\ x2 = \frac{2 - 4}{2} \\ x2 = \frac{ - 2}{2} \\ x2 = - 1$
x'=3 e x"=-1