Question

(x-2)(x+2)-(x-5)² помогите​

Answer 1

$(x - y)(x + y) = {x}^{2} - {y}^{2} \: \: (x - y {)}^{2} = {x}^{2} - 2xy + {y}^{2} \\ \\ (x - 2)(x + 2) - (x - 5 {)}^{2} = {x}^{2} - 4 - ( {x}^{2} - 10x + 25) = {x}^{2} - 4 - {x}^{2} + 10x - 25 = 10x - 29$