persamaan sumbu simetri grafik fungsi f(x)=(2x-3) (x-5) adalah...

f(x) = (2x - 3)(x - 5)
f(x) = 2x² - 13x + 15
a = 2 ; b = -13 ; c = 15

sumbu simetri = x = -b/2a

x = -(-13)/(2.2)
x = 13/4