(a + 3) {}^{2} + (a - 3)(3 + a) - 2(a + 2)(a - 4) \: pri \: a = - \frac{1}{5}...

Question

(a + 3) {}^{2} + (a - 3)(3 + a) - 2(a + 2)(a - 4) \: pri \: a = - \frac{1}{5} [/tex]
пожалуйста помогите

Answer 1

(a+3)²+(a-3)(3+a)-2(a+2)(a-4)= a²+9+6a+a²-9-2(a²-2a-8)= 2a²+6a-2a²+4a+16= 10a+16= 10*(-1/5)+16= -2+16=14