Question

Упростите выпажение:
40с²-(1+6с)²+1

Answer 1

$40 c^{2}- (1+6c)^{2} +1=40 c^{2}- (1+12c+36c^{2}) +1=$
$40 c^{2}-1-12c-36c^{2}+1=40 c^{2}-36c^{2}-12c=$
$40 c^{2}-36c^{2}-12c= 4c^{2}-12c=4c(c-3)$