1) 19;2) 15;3) c = 7;4) c = 9.
1) x = -1, x = 4;2) x = -1/2, x = -2;3) x = -1 - isqrt(3), x = -1 + isqrt(3);4) x = 1 + 3i, x = 1 - 3i.
1) 19;
2) 15;
3) c = 7;
4) c = 9.
1) x = -1, x = 4;
2) x = -1/2, x = -2;
3) x = -1 - isqrt(3), x = -1 + isqrt(3);
4) x = 1 + 3i, x = 1 - 3i.