There needs to be some operator (+,*,/ etc) between "third power" and "7".
3x3 - 3x2 + 2x - 2 = 3x2(x - 1) + 2(x - 1) = (3x2 + 2)(x - 1)
The last one is an example of like terms.
3x^2 + x + 2x^2 = 5x^2 + x
(3x)^(2-4) = (3x)^-2 = (9x2)^-1 = 1/(9x2)
(4x ^2 + 3) + (3x ^2 + 8) = ( 4x^2 + 3x^2 ) + (3+8) = 7x^2 + 11
5x^3(3x + 2)
2
3x3 - 3x2 + 2x - 2 = 3x2(x - 1) + 2(x - 1) = (3x2 + 2)(x - 1)
The last one is an example of like terms.
7
(3x^2 - 4y^2)(3x^2 + 4y^2)
(5.9x^3 + 3.4x^2 - 7) - (2.9x^3 - 9.6x^2 + 3) = 3x^3 +13x^2 -10
4
3x^2 + x + 2x^2 = 5x^2 + x
(3x)^(2-4) = (3x)^-2 = (9x2)^-1 = 1/(9x2)
9x
512