diketahui fungsi g(x)=ax²+b.Jika g(2)=-1 dan g(-4)=5,nilai g(-1)+2=

g(x) = ax² + b

g(2) = -1
a(2)² + b = -1
4a + b = -1

g(-4) = 5
a(-4)² + b = 5
16a + b = 5

16a + b= 5
4a + b = -1
------------------- -
12a = 6
a = 6/12
a = 1/2

4a + b = -1
4(1/2) + b = -1
2 + b = -1
b = -1 - 2
b = -3

g(x) = 1/2x² - 3
g(-1) + 2 = 1/2(-1)² - 3 + 2
               = 1/2 - 3 + 2
               = 1/2 - 1
               = -1/2