1.a=34.5
a^2-(a-1)(a+1) = a^2- (a^2-1) = 1
2. a=444.4
a^2-(a+100)*(a-100) = a^2-(a^2-100^2) = 10 000
1.a=34.5
a^2-(a-1)(a+1) = a^2- (a^2-1) = 1
2. a=444.4
a^2-(a+100)*(a-100) = a^2-(a^2-100^2) = 10 000