ա) (a+1)(a+1)=a²+a+a+1=a²+2a+1

բ) (x+1)(x+2)=x²+2x+x+2=x²+3x+2

գ) (2+y)(y+3)=2y+6+y²+3y

դ) (a+b)(a+b)=a²+ab+ba+b²=a²+2ab+b²

ե) (1+x)(1-x)=1+x+x-x

զ) (a-2)(3-a)=3a-a²-6+2a

է) (x-y)(x+y)=x²+xy-xy-y²=x²-y²

ը) (a-b)(a-b)=a²-ab-ab+b²=a²-2ab+b²

թ) (2a+b)(a+2b)=2a²+4ab+ab+2b²=2a²+5ab+2b²

ժ) (3x+2y)(3x+2y)=9x²+6xy+6xy+4y²=9x²+12xy+4y²

ա) (5m + 7n)(2n + 4m)=10mn+20m²+14n²+28mn=20m²+38mn+14n²

բ) (12a + b)(3a + 5b)=36a²+60ab+3ab+5b²=36a²+63ab+5b²

գ) (2x − 3y)(2x + 3y)=4x²+6xy-6xy-6y²=4x²-6y²

դ) (5m − 2n)(3n − 5m)=15mn-25m²-6n²+10mn=25m²-25mn+6n²

ե)(-а – b)(2a – 3b) = -2a² + 3ab – 2ab + 3b² = -2a² + ab + 3b²

զ)(-7x – 4y)(-5x + 7y) = -35x² – 49xy + 20xy – 28y² = -35x² – 29xy – 28y²

է)(a² + b²)(a² + b²) = a⁴ + a²b² + a²b² + b⁴ = a⁴ + 2a²b² + b⁴

ը)(mn³ – m²)(m – 1) = m²n³ – mn³ – m³ + m²

թ)(2x² – y²)(y² + 2x³) = 2x²y² + 4x⁵ – y⁴ + 2x³y²

ժ) (xy²+3a²)(3xy+a³)=3x²y³+a³xy²+9a²xy+3a⁵