4(-1+1/2a)(-1-1/2a)-(2a-1)(2a+1)-(a-5)(-a+1)+2(a^2+3a-5)=
4(-1+1/2a)(-1-1/2a)-(2a-1)(2a+1)-(a-5)(-a+1)+2(a^2+3a-5)=
490
punti
Livello 1
594)
$4\big(-1+\frac{1}{2}a\big)\big(-1-\frac{1}{2}a\big)-(2a-1)(2a+1)-(a-5)(-a+1)+2(a^2+3a-5)$ =
= $4\big(1-\frac{1}{4}a^2\big)-(4a^2-1)-(-a^2+a+5a-5)+2a^2+6a-10$ =
= $4-a^2-4a^2+1+a^2-a-5a+5+2^2+6a-10$ =
= $-2a^2$
48230
punti
Genius I