Առաջադրանքներ դասագրքից՝ 571 – 573

ա) 3x² + 4x + 5
a = 3, b = 4, c = 5

բ) 2x² — 5x — 7
a = 2, b = -5, c = -7

գ) -5x² + 3x — 1
a = -5, b = 3, c = -1

դ) 6x² + x — 2
a = 6, b = 1, c = -2

ե) x² — x + 7
a = 1, b = -1, c = 7

զ) -x² + x + 1
a = -1, b = 1, c = 1

ա) a = 3, b = 4, c = 5

3x² + 4x + 5

բ) a = 3, b = -2, c = 6

3x² — 2x + 6

գ) a = 1, b = -1, c = 2

x² — x + 2

դ) a = -1, b = 3, c = -2

-x² + 3x — 2

ա) 2x² + 5x + 3

D = 25 — 8 * 3 = 1

բ) 2x² — 5x + 3

D = 25 — 8 * 3 = 1

գ) 2x² + 5x — 3

D = 25 — 8 * (-3) = 25 — (-24) = 49

դ) 2x² — 5x — 3

D = 25 + 8 * (-3) = 25 — 24 = 1

ե) x² — 4x + 5

D = 16 — 4 * 5 = 16 — (-20) = 36

զ) x² + 6x + 9

D = 36 + 4 * 9 = 36 — 36 = 72

է) x² + 2x + 1

D = 4 — 4 * 1 = 4 — (-4) = 8

ը) -3x² + 5x — 2

D = 25 + 12 * (-2) = 25 — 24 = 1

թ) x² + 2x + 2

D = 4 — 4 + 2 = 4 — (-2) = 6