Question

вычислите (8а-3)^2
(9x-3y)*(9x+3y)

Answer 1

$(8a-3)^{2} \\ (8a)^{2}-2*8a*3+3^{2} \\ 64a^{2}-48a+9 \\ (9x-3y)*(9x+3y) \\ (9x)^{2}-(3y)^{2} \\ 81x^{2}-9y^{2}.$