Question

Помогите срочно
Даю 52 бала

Answer 1

1)

${x}^{2} + 4x - 7 = 0 \\ - 7 {x}^{2} - 8x + 11 = 0 \\ - 5 {x}^{2} + 7x - 5 = 0$

2)

${x}^{2} - 7x - 18 = 0 \\ x _{1} + x _{2} = 7\\ x _{1} \times x _{2} = - 18$

${x}^{2} + 4x - 5 = 0 \\ x _{1} + x _{2} = - 4 \\ x _{1} \times x _{2} = - 5$

3)

${x}^{2} - 4x - 12 = 0 \\ x _{1} + x _{2} = 4 \\ x _{1} \times x _{2} = - 12 \\ x _{1} = 6 \\ x _{2} = - 2$

4)

${x}^{2} + 4x - 21 = 0 \\ x _{1} + x _{2} = - 4 \\ x _{1} \times x _{2} = - 21 \\ x _{1} = 3 \\ x _{2} = - 7$