1) (3в-1)(3в+1= 3в(3в) + 3в(1) - 1(3в) - 1(1= 9в^2 + 3в - 3в - = 9в^2 - 1
2) (4в+1)(1-4в= 4в(1) + 4в(-4в) + 1(1) + 1(-4в= 4в - 16в^2 + 1 -4= -16в^2 + 4в - 4в + = -16в^2 + 1
1) (3в-1)(3в+1
= 3в(3в) + 3в(1) - 1(3в) - 1(1
= 9в^2 + 3в - 3в -
= 9в^2 - 1
2) (4в+1)(1-4в
= 4в(1) + 4в(-4в) + 1(1) + 1(-4в
= 4в - 16в^2 + 1 -4
= -16в^2 + 4в - 4в +
= -16в^2 + 1