Question

поиогите пж срочно. 1 вариань

Answer 1

1.
а)
$2 {x}^{2} = 18 \\ {x}^{2} = 9 \\ x1 = 3 \\ x2 = - 3$
Б)
$x(x + 2) = 0 \\ x1 = 0 \\ x + 2 = 0 \\ x2 = - 2$
В)
$x = 0$
Г)
${4x}^{2} - 11 - {x}^{2} + 11 - 9x = 0 \\ {3x}^{2} - 9x = 0 \\ 3x(x - 3) = 0 \\ 3x = 0 \\ x1 = 0$
$x - 3 = 0 \\ x2 = 3$
2.

а)
$d = 25 - 24 = 1 \\ x1 = \frac{5 + 1}{2} = \frac{6}{2} = 3 \\ x2 = \frac{5 - 1}{2} = \frac{4}{2} = 2$
б)
$d = 64 - 64 = 0 \\ x1 = \frac{ - 8 - 0}{2} = - \frac{8}{2} = - 4$
в)
${t}^{2} + 3t - 1 = 0 \\ d = 9 - 8 = 1 \\ t1 = \frac{ - 3 - 1}{2} = - \frac{4}{2} = - 2$
$t2 = - \frac{3 + 1}{2} = - \frac{2}{2} = - 1$
Г)
$a(3a + 1) = 4 \\ a = 4 \\ 3a + 1 = 4 \\ a = 1$