
Է)(x + 1)(x2 – x + 1) = x3 – x2 + x + x2 – x + 1 = x3 + 1
ը)(x – 1)(x2 + x + 1) = x3 + x2 + x – x2 – x – 1 = x3 – 1
թ)(x3 + 2x – 3)(2 – 3x) = 2x3 — 3x4 + 4x – 6x2 – 6 + 6x = 2x3 — 3x4 + 10x – 6x2 – 6
ժ)(5m2 – 3mn + n2)(2n + m2) = 10m2n + 5m4 – 6mn2 – 3m2n + 2n3 + m2n2 = 5m4 – 6mn2 – 13m2n + 2n3 + m2n2
ի)(a + b + c)(a + b – c) = a2 + ab – ac + ab + b2 – bc + ac + bc – c2 = a2 + 2ab + 2ac + b2
լ)(a – b + c)(a – b – c) = a2 + ab – ac + ab + b2 – bc + ac + bc – c2 = a2 + 2ab + 2ac + b2

դ)-(2m – n)(n – 3m) = 2mn – 6m2 – n2 + 3mn = 2mn + 6m2 + n2 — 3mn
ե)-(5a – 2b)(3b + 2a) = 25ab + 10a2 – 6b2 — 4ab = 25ab — 10a2 + 6b2 + 4ab
զ)-7(x + 8y)(y – 3x) = -7(xy – 3x2 + 8y2 – 24xy) = 21x2 – 56y2 + 161xy

բ)8x – 3 * 4x + 5 = 32x2 + 40x – 12x – 15 = 32x2 + 28x – 15
դ)4a – 3(2a – 3) = 8a2 – 12a – 6a + 9 = 8a2 – 6a + 9


