nafanya2014

Verified answer

(3х+4)(9х²-12x+16)=(3x)³+4³
(3x-1)(3x+1)=(3x)²-1


(3х+4)(9х²-12x+16)-64-3(3x-1)(3x+1)+x²  =(3x)³+4³-64-3·(9x²-1)+x²=(3x)³-27x²+3+x²=27x³-26x²+3

При х=1 получим
27-26+3=4