Ok, i did this problem in several methods we've been taught, but none of them reached the answer in the check your work section. As it was the last one with the given answer, and i was so far off in the answer, i'm worried about the remaining ones done in that method. heres the problem i cant get the book answer to:

Apply the distributive property. Then simplify by combining like terms.

65.7x- 3x(x+ 1)

Answer in book: 4x- 3xsquared

and heres the problems im nervous about

66.-4(y+ 2) - 6y

67.3t(t- 5) + 6t squared

68.-x cubed+ 2x(x-x squared)

Thanks in advance

Note: 'squared' means raised to the second power, and 'cubed' means to the third power. i dont know how to make the floating 2 or 3 symbol.