Ответ:

(x-2)(x+2)-(x-5)²​ = x²​-2²​-(x-5)² ​= x²​-4-(x-5)²​

x²​-4-(x-5)²​ = x²​-4-(x²​-10x+25) = x²​-4-x²​+10x-25

x²​-4-x²​+10x-25 = 10x-25-4 = 10x-29