Question

qual a resposta de x²+2x-3=0

Answer 1

$\Delta = b^2 - 4.a.c \\\Delta = 2^2 - 4.1.(-3) \\ \Delta = 4 + 12 \\ \Delta = 16\\ -------\\ x = \frac{-b \pm \sqrt{\Delta}} {2.a} \\ \\ x = \frac{-2 \pm \sqrt{16}}{2} \\ \\x = \frac{-2 \pm 4}{2} \\ \\ ----- \\ \\ x' = \frac{-2+4}{2} = 1 \\ \\ ----- \\ \\ x'' = \frac{-2-4}{2} = -3$

Answer 2

Resposta:

Bom dia!

Explicação passo-a-passo:

x²-2x-3=0 a=1/b=-2/c=-3. Δ=b²-4.a.c. Δ=(-2)²-4.1(-3) Δ=4 + 12. Δ=16 x=-b+-√Δ 2.a x=-(-2)+-16 2.1 x=2+-4 2 x¹=2+4 ⇒ 6 ⇒ 3 2 2