Answer:
D
Step-by-step explanation:
Given a quadratic in standard form
y = ax² + bx + c ( a ≠ 0 )
Then the y- intercept is the value of the constant term c
A
y = (x + 1)(x - 3)
= x² - 2x - 3 ← y- intercept = - 3
B
y = x² - 9 ← y- intercept = - 9
C
y = 3x(x - 3)
= 3x² - 9x ← y- intercept = 0
D
y = (x + 1)(x + 3)
= x² + 4x + 3 ← with y- intercept 3
