Выражение: a) 5a^2* (-3a^3)^2 b) (x-3)*(x-7)+2x* (3x-5) c) (c-4) * (c+4)- (c+3) ^2

A) 5a^2* (-3a^3)^2 = 5а∧2 * 9а∧6 = 45а∧8,
B) (x-3)*(x-7) + 2x* (3x-5) = х²-7х-37+21+6х²-10х = 7х²-17х-16,
C) (c-4) * (c+4)- (c+3) ^2 = с²-16-с²-6с-9 = -6с-25 ( или -(6с+25)  )

A) 5a^2* (-3a^3)^2 = 5а∧2 * 9а∧6 = 45а∧8,B) (x-3)*(x-7) + 2x* (3x-5) = х²-7х-37+21+6х²-10х = 7х²-17х-16,C) (c-4) * (c+4)- (c+3) ^2 = с²-16-с²-6с-9 = -6с-25 ( или -(6с+25)  )