Question

выполните умножение: а)(2m+1)*(2m+5) б)(3x+2)*(x+3) в)(5m-1)*(m+1) г)(4n+7)*(2n-3) д)(y-4)*(3y-4) е)(6a-5)*(6a-1) ж)(2b+3)*(3b-2) з)(7z-2)*(z-3)

Answer 1

А) 4m^2+10m+2m+5 Б)3x^2+9x+2x+6 В)5m^2+5m-m-1

Answer 2

г)8n^2-12n+14n-21д)3y^2-4y-12y+16e)36a^2-6a-30a+5ж)6b^2-4b+9b-6з)7z^2-21z-2z+6

Answer 3

а) (2m+1)(2m+5) = 4m^2 + 12m + 2m + 5 = 4m^2 + 14m + 5 б) (3x+2)(x+3) = 3x^2 + 11x + 6 в) (5m-1)(m+1) = 5m^2 + 4m - 1 г) (4n+7)(2n-3) = 8n^2 - 12n + 28n - 21 = 8n^2 + 16n - 21 д) (y-4)(3y-4) = 3y^2 - 16y + 16 е) (6a-5)(6a-1) = 36a^2 - 36a - 5(6a) + 5 = 36a^2 - 66a + 5 ж) (2b+3)(3b-2) = 6b^2 - 4b + 9b - 6 = 6b^2 + 5b - 6 з) (7z-2)(z-3) = 7z^2 - 21z - 2z + 6 = 7z^2 - 23z + 6