10ab+(-5a+b)^2 при a=√10 b=√5

Question

10ab+(-5a+b)^2 при a=√10 b=√5

Answer 1

10ab+(b-5a)^2
10ab+b^2-10ab+25a^2
b^2+25a^2 a= √10 b= √5
5+250=255

Answer 2

10ab+25a^2-10ab+b^2 = 25a^2+b^2