Question

Let f(x) be a quadratic function. If the coordinates of the vertex of the graph of y=f(x) are (3,-4), which of the following must be true?

A. The roots of the equation f(x)=0.
B. The roots of the equation f(x)-3=0 are rational numbers.
C. The roots of the equation f(x)+4=0 are real numbers.
D. The roots of the equation f(x)+5=0 are non-real numbers.

Answer 1

@appleduardo

Answer 2

idk may be c ?

Answer 3

c is true but why? :O

Answer 4

well, cos we have a negative, so, real numbers include both + & - numbers

Answer 5

then why A is wrong? :O

Answer 6

cos the roots aint 0 :P

Answer 7

oh i seeeee
thanks :P