Question

usanfo a fórmula de baskara responda

${n}^{2} - 2n - 15 = 0$

Answer 1

∆=
${b}^{2} - 4 \times a \times c \\ {( - 2)}^{2} - 4 \times 1 \times ( - 15) \\ 4 + 60 \\ 64 \\ n1 = \frac{2 + 8}{2} = \frac{10}{2} = 5 \\ n2 = \frac{2 - 8}{2} = \frac{ - 6}{2} = - 3$