Answer:
a) zeros at x = -3 and x = 7
b) y-intercept at y = -21
c) vertex =-25
d) x=2
e) (2;-25)
Step-by-step explanation:
a) 0= (x+3)(x-7)
This can only equal to zero if
x+3 = 0 that is x = -3
or
x-7 = 0, that is x = 7
b)
y-intercept is at x = 0,
y = (0+3)(0-7) = 3(-7) = -21
c) Rewriting in vertex form
y = (x+3)(x-7) = [tex]x^{2}[/tex] -4x - 21 = [tex](x-2)^{2}[/tex]- 25
Therefore the vertex is -25
d) x= 2
e) symmetrical point is at (2;-25)
