pakai caraaaaaaaaaaaaa

f(x) = ax +b
f(2) = 2a +b =11
f(-5) = - 5a+b =-10
....................... -
7a +0 =21
a = 21/7 = 3
Karena a =3 maka
2a +b =11
2.3 +b =11
6+b =11
b =11-6
b = 5
Jadi nilai (a+b)^2 = (3+5)^2
= 8^2
= 64 (B)