Դասարանական Աշխատանք

ax^2 + bx+ c = 0
D = b^2 — 4ac

5x^2 — 6x — 4 = 0
a = 5, b = -6, c = -4
D = 36 — 4 * 5 * (-4) = 36 + 80 = 116

Վարժ. 591
ա) 2x^2 — 3x — 5 = 0
a = 2, b = -3, c = -5
D = 9 — 4 * 2 * (-5) = 9 + 40 = 49
բ) x^2 + 5x + 1 = 0
a = 1, b = 5, c = 1
D = 25 — 4 * 1 * 1 = 25 — 4 = 21
գ) 9x^2 — 6x + 1 = 0
a = 9, b = -6, c = 1
D = 36 — 4 * 9 * 1 = 36 — 36 = 0
դ) x^2 + x + 1 = 0
a = 1, b = 1, c = 1
D = 1 — 4 * 1 * 1 = 1 — 4 = -3

Վարժ. 573
ա) 2x^2 + 5x + 3 = 0
a = 2, b = 5, c = 3
D = 25 — 4 * 2 * 3 = 25 — 24 = 1
բ) 2x^2 — 5x + 3 = 0
a = 2, b = -5, c = 3
D = 25 — 4 * 2 * 3 = 25 — 24 = 1
գ) 2x^2 + 5x — 3 = 0
a = 2, b = 5, c = -3
D = 25 — 4 * 2 * (-3) = 25 + 24 = 49
դ) 2x^2 — 5x — 3 = 0
a = 2, b = -5, c = -3
D = 25 — 4 * 2 * (-3) = 25 + 24 = 49
ե) x^2 — 4x + 5 = 0
a = 1, b = -4, c = 5
D = 16 — 4 * 1 * 5 = 16 — 20 = -4
զ) x^2 + 6x + 9 = 0
a = 1, b = 6, c = 9
D = 36 — 4 * 1 * 9 = 36 — 36 = 0
է) x^2 + 2x + 1 = 0
a = 1, b = 2, c = 1
D = 4 — 4 * 1 * 1 = 4 — 4 = 0
ը) -3x^2 + 5x — 2 = 0
a = -3, b = 5, c = -2
D = 25 — 4 * (-3) * (-2) = 25 — 24 = 1
թ) x^2 + 2x + 2 = 0
a = 1, b = 2, c = 2
D = 4 — 4 * 1 * 2 = 4 — 8 = -4