Question

Jika grafik f(x) = 2x kuadrat + bx - 5 simetri pada garis x = 5, berapakah nilai b?

Kasih tau caranya juga yaa

Answer 1

Persamaan sumbu simetri x= -b/2a = -b/(2*2) = 5 diperoleh b=-20

Answer 2

F(×) = 2×^2 + bx - 5
f(5) = 2.5^2 + 5b - 5
= 50 + 5b - 5
= 5b + 45
5b + 45 = 0
-5b = 45
b = -9