Question

(3а - 2b)^2 – 4(За – 2b) -21​

Answer 1

Step-by-step explanation:

(3а - 2b)² – 4(За – 2b) - 21

x = 3a - 2b

x² – 4x - 21

x² - 7x + 3x - 21

x(x - 7) + 3(x - 7)

(x - 7) (x + 3)

(3а - 2b - 7) (За – 2b + 3)