Question

(x+2)^2-(x+1) ori (×-1)=

Answer 1

${(x + 2)}^{2} - (x + 1)(x - 1) \\ = {x}^{2} + 2 \times x \times 2 + {2}^{2} - ({x}^{2} - {1}^{2} ) \\ = {x}^{2} + 4x + 4 - {x}^{2} + 1 \\ = 4x + 5$