Question

Calculati:
a) (x-5) (x-6)

Answer 1

(x-5) = (1-5)= -4
(x-6) = (1-6)=-5
-4×-5 =-20

Answer 2

$x {}^{2} - 6x - 5x + 30 \\ = x { }^{2} - 11x + 30$