Question

Calcule A) (X-1). (x-13). (X-1). (x-3)

Answer 1

(x-1)(x-13)(x-1)(x-3) = 
(x² - 13x - x + 13)(x² - 3x - x + 3) = 
(x² - 14x + 13)(x² - 4x + 3) = 

x⁴ - 4x³ + 3x² - 14x³ + 56x² - 42x + 13x² - 52x + 39 = 
x⁴ - 18x³ + 72x² - 94x + 39