4a (a-2) - (a-4) (квадрат)

Question

4a (a-2) - (a-4) (квадрат)

Answer 1

4a^2 - 8a - a + 4 = 4a^2 - 9a + 4

Answer 2

4a(a-2)- (a-4)ˇ2=4aˇ2-8a-aˇ2+8a-16=3aˇ2-16