Question

(0,4х^6-5)(5х^3+2)-х^3(2х^6+0,8х^3-25)

Answer 1

$(0,4x^{6} -5)(5x^{3} +2)-x ^{3} (2 x^{6}+0.8x^{3} -25)=$
$2x^{9} +0.8 x^{6} -25x^{3} -10-2x ^{9} -0.8x^{6} +25x^{3} =-10$