kak nomor 16 bantuanya

Diketahui :
f(2) = 11
f(-5) = -10

Ditanya : nilai (a+b)² = ?

Jawab :
f(2) = 11
2a + b = 11

f(-5) = -10
-5a + b = -10

2a + b = 11
-5a + b = -10
_________ _
7a = 21
a = 21/7
a = 3

2a + b = 11
2(3) + b = 11
6 + b = 11
b = 11 - 6 = 5

nilai (a+b) ² =
(3+5)² = 8² = 64 (B)

Smoga membantu :))