Преобразуйте в многочлен выражения: -(u-3)(u--6)(u+6)

1) - ( u - 3 )( u - 1 ) = - ( u^2 - u - 3u + 3 ) = - ( u^2 - 4u + 3 ) = - u^2 + 4u - 3 
2) - ( u - 6 )( u + 6 ) = - ( u^2 - 36 ) = - u^2 + 36
3) - u^2 + 4u - 3 - u^2 + 36 = - 2u^2 + 4u + 33 

-(u-3) (u-1)-(u-6)(u+6)= -( u²-u-3u+3)-(u²+6u-6u-36)=-u²+u+3u-3-u²-6u+6u+36=-2u²+4u+33