Question

(2a+1)^2+2(2a+1)(a-1)+(a-1)^2 при a= -3,5 (с решением)

Answer 1

$(2 times ( - 3.5) + 1 {)}^{2} + 2(2 times ( - 3.5) + 1) times ( - 3.5 - 1) + ( - 3.5 - 1 {)}^{2} = \ = ( - 7 + 1 {)}^{2} + 2( - 7 + 1) times ( - 4.5) - ( - 4.5 {)}^{2} = \ = ( - 6 {)}^{2} + 2 times ( - 6) times ( - 4.5) + ( - frac{9}{2} {)}^{2} = \ = 36 + 54 + frac{81}{4} = \ = 90 + frac{81}{4} = frac{441}{4} = 110 frac{1}{4}$