Solving quadratic equations by quadratic formula and Complex Numbers
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-5
x² + 10x + 25 = 0
(-3 ± i√3)/2
x² + 3x + 8 = 5
-6, 3
x² + 3x - 18 = 0
-3
x² + 6x + 9 = 0
2
x² - 4x + 4 = 0
-1, 5
x² - 4x - 5 = 0
0, 8
x² - 8x = 0
6-3i
(2+3i) + (4-6i)
22-4i
(2-4i)(3+4i)
-9 - 7i
(3 - 2i)(-1-3i)
7+22i
(3+2i)(5+4i)
-1-13i
(4-3i) - (5+10i)
26-13i
(4-7i)(3+2i)
58-30i
(5+i)(10-8i)
4 + 4i
(6+i) - (2-3i)
13-16i
(6-5i) + (7-11i)
2-i
(9-6i) - (7-5i)
(2 ± √2)/2
2x² - 4x + 1 = 0
-½, 5
2x² - 9x - 10 = 0
-7, 0
3x² + 21x = 0
2 ± √3
4x - 1 = x²
-3, ¼
4x² + 11x - 3
± √2
4x² = 8
± i √10
7x² + 70 = 0
1
7x² - 14x + 7 = 0
12
(-2 - 2i)(-3 + 3i)
-10+10i
(-2+4i) - (8-6i)
2-2i
(-4+i) + (6-3i)