Question

вычислите (8а-3)^2
(9x-3y)*(9x+3y)

Answer 1

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