Question

упростите 4a(a-2)-(a-4)
(a-4) в квадрате

Answer 1

4a (a - 2) - (a - 4)^2 = 
= 4a^2 - 8a - (a^2 - 8a + 16) = 
= 4a^2 - 8a - a^2 + 8a - 16 = 
= 3a^2 - 16