Question

1)9x-5x^2=-2.
2)a^2=52a-576.
3)-y^2=5y-14
4)c^2-25=c-5
быстрее пж пж даю 30 балов​

Answer 1

Ответ:

1 9x - 5x ^ 2 = - 2

5x ^ 2 - 9x - 2 = 0 D = 81 + 40 = 121

x_{2} = (9 + 11) / 10 = 20/10 = 2

Ответ: -0,2; 2.

2) a ^ 2 = 52a - 576

x_{1} = (9 - 11) / 10 = - 2/10 = 0, 2 a ^ 2 - 52a + 576 = 0 ; D = 2704 - 2304 = 400 a_{1} = (52 - 20) / 2 = 32/2 = 16 a_{2} = (52 + 20) / 2 = 72/2 = 36 y_{2} = (- 5 + 9) / 2 = 4/2 = 2 c ^ 2 - c - 20 = 0 D = 1 + 80 = 81 c_{1} = (1 - 9) / 2 = - 8/2 = - 4 Ответ: -4; 5.

Ответ: 16; 36.

3) - y ^ 2 = 5y - 14

y ^ 2 + 5y - 14 = 0 D = 25 + 56 = 81

y_{1} = (- 5 - 9) / 2 = - 14/2 = - 7

Ответ: -7; 2.

4) c ^ 2 - 25 = c - 5

c ^ 2 - 25 - c + 5 = 0

c_{2} = (1 + 9) / 2 = 10/2 = 5