Question

упростите: (а-4)^2-(а-1)(а+1)

Answer 1

( a - 4 )^2 - ( a - 1 )( a + 1 ) = a^2 - 8a + 16 - ( a^2 - 1 ) = a^2 - 8a + 16 - a^2 + 1 = - 8a + 17