Question

Calcule
(a+4b²)

(2xy+3x)²

(2k-3)²

(5x-3b)²

(2xy+2b)•(3xy-4)

(xa+3a)•(2xy-2b)

Grata

Answer 1

(a+4b)² = a^2 + 8ab + 16b^2

(2xy+3x)²  = 4x^2y^2 + 12x^2y + 9x^2

(2k-3)²  = 4k^2 - 12k + 9

(5x-3b)²  = 25x^2 - 30bx + 9b^2

(2xy+2b)•(3xy-4)  = 6x^2y^2 - 8xy + 6bxy - 8b

(xa+3a)•(2xy-2b) = 2ax^2y - 2abx + 6axy - 6ab