Question

Упростите выражение:..

Answer 1

$\displaystyle\bf\\3(4a-1)^{2} -(44a^{2} +9)-(2a-1)(2a+1)+5=\\\\\\=3\cdot(16a^{2} -8a+1)-44a^{2}-9-(4a^{2} -1)+5=\\\\\\=48a^{2} -24a+3-44a^{2}-9-4a^{2} +1+5=\\\\\\=\underbrace{(48a^{2} -44a^{2}-4a^{2}) }_{0} -24a+\underbrace{(3-9+1+5)}_{0}=-24a$