ա) x2 = 36
x = ± 6
բ) x2 = -1
x = Ø
գ) x2 = 21
x = ± √21
դ) x = 0
ե) x2 = 4
x = ± 2
զ) x2 = 9
x = ± 3
է) x2 = 16
x = ± 4
ը) 2x2 = 18
x2 = 9
x = ± 3
ա) x(x + 5) = 0
x = 0
x + 5 = 0
__
x1 = 0
x2 = — 5
բ) x2 — 9x = 0
x(x — 9) = 0
x = 0
x — 9 = 0
x1 = 0
x2 = 9
__
գ) x2 + 2x — 7x = 0
x2 — 5x = 0
x(x — 5) = 0
x = 0
x — 5 = 0
x1 = 0
x2 = 5
__
դ) x2 + x — 5x + x2 = 0
2x2 — 4x = 0
x(2x — 4) = 0
x = 0
2x — 4 = 0
x1 = 0
x2 = 2
ե) x(2x — 8) = 0
x = 0
2x — 8 = 0
x1 = 0
x2 = 4
__
զ) 3x2 — 3x — x — x2 = 0
2x2 — 4x = 0
x(2x — 4) = 0
x = 0
2x — 4 = 0
x1 = 0
x2 = 2
__
է) x2 + 8x — 2x = 0
x2 + 6x = 0
x(x + 6) = 0
x = 0
x + 6 = 0
x1 = 0
x2 = -6
__
ը) 6x2 — 10x — 3x2 = 0
3x2 — 10x = 0
x(3x — 10) = 0
x = 0
3x — 10 = 0
x1 = 0
x2 = 10/3
ա) x2 — 5x — x2 — x = 0
-6x = 0
բ) x2 — 2x — 1 + 2x = 0
x2 — 1 = 0
x2 = 1
x = ± 1
գ) x2 + 3x — 3x + 3 = 0
x2 + 3 = 0
x2 = — 3
x = Ø
դ) 2x2 + 6x — 5x = 0
2x2 + x = 0
x(2x + 1) = 0
x = 0
2x + 1 = 0
x1 = 0
x = -1/2
ե) x2 + x + 2x + 2 — 2 = 0
x2 + 3x = 0
x(x + 3) = 0
x = 0
x + 3 = 0
x1 = 0
x2 = -3
__
զ) 1.4x2 + 3x — 5.8x = 0
1.4x2 — 2.8x = 0
x(1.4x — 2.8) = 0
x = 0
1.4x — 2.8 = 0
x1 = 0
x2 = 2
է) x2 — 4 = 5
x2 = 9
x = ± 3
ը) x2 + 3x — 2x — 6 — x — 10 = 0
x2 — 16 = 0
x2 = 16
x = ± 4
ա) x2 + 5x — 2x — 10 — x2 — 3x — 11 = 0
— 21 = 0
x = Ø
բ) 2x2 + 4x — x — 2 — 4x + 2 = 0
2x2 — x = 0
x(2x — 1) = 0
x = 0
2x — 1 = 0
x1 = 0
x2 = 1/2
գ) 8 — x2 — 2x — x — 2 — x2 + 2x + x + 2 = 0
8 — 2x2 = 0
2x2 = 8
x2 = 4
x = ± 2
դ) 3x (2x + 1) + 5 — x = 2x + 12.6
6x2 + 3x + 5 — x — 2x — 12.6 = 0
6x2 — 7.6 = 0
6x2 = 7.6
x2 = 1.21
x = ± 1.1
ե) 2x2 + 2x — 6x + 15x2 = 0
17x2 — 4x = 0
x(17x — 4) = 0
x = 0
17x — 4 = 0
x1 = 0
x2 = 4/17
զ) x2 + 5x + 3x + 15 — 8x + 8 = 0
x2 + 23 = 0
x2 = — 23
x = Ø
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