Question

Cat face (2y-5) la a 2 a(sa si explice sa inteleg ):))) si cat face si (4x-y) la a 2 a la fel sa explice

Answer 1

(2y-5)² = (2y)² - 2*2y *5 + 5² = 4y² - 20y +25

(4x-y)² = (4x)² - 2*4x*y +y² = 16x² - 8xy +y²

Answer 2

(a - b)² = a² - 2 × a × b + b²

(2y - 5)² = (2y)² - 2×2y×5 +(5)² = 4y² - 20y + 25

(4x - y)² = (4x)² - 2×4x×y + (y)² = 16x² - 8xy + y²