Question

Выполните умножение:
(x-5)*(x+5)=
(7c+3)*(7c-3)=
(4x-9y)*(4x+9y)
($a^{2}$-2b)*($a^{2}$+2b)=

Answer 1

(x-5)·(x+5)=х²-25
(7c+3)·(7c-3)=49с²-9
(4x-9y)·(4x+9y)=16х²-81у²
(а²-2b)·(а²+2b)=а⁴-4b²