tolong jawab sama bantuin cara nya yaa

y = ax^2 + bx + c puncaknya di x = 1 1/2 = 3/2
=> x = -b/(2a) = 3/2
=> -b/a = 3
=> b = -3a
y = ax^2 - 3ax + c

2x - y + 5 = 0 => y = 2x + 5 memotong parabola di x = 1 dan x = 3

y = y
ax^2 - 3ax + c = 2x + 5
x = 3 => 9a - 9a + c = 6 + 5 => c = 11
x = 1 => a - 3a + c = 2 + 5 => -2a + 11 = 7 => -2a = -4 => a = 2
b = -3a = -6
Jadi
y = ax^2 + bx + c
y = 2x^2 - 6x + 11