Factor the function represented by f (x) and explain how the factored form relates to the graph of the function. $f ( x ) = x ^ { 2 } - 4 x - 21$
A) $f ( x ) = ( x + 3 ) ( x - 7 ) ; x = - 3$ and $x = 7$ represent the $y$-intercepts.
B) $f ( x ) = ( x - 3 ) ( x + 7 ) ; x = 3$ and $x = - 7$ represent the $x$-intercepts.
C) $f ( x ) = ( x - 3 ) ( x + 7 ) ; x = 3$ and $x = - 7$ represent the $y$-intercepts.
D) $f ( x ) = ( x + 3 ) ( x - 7 ) ; x = - 3$ and $x = 7$ represent the $x$-intercepts.

Question

Quizplus · Accepted Answer

The factored form of $f(x) = x^2 - 4x - 21$ is $f(x) = (x + 3)(x - 7)$, which shows the roots or x-intercepts of the graph at $x = -3$ and $x = 7$, not the y-intercepts.

Factor the Function Represented by F (X) and Explain How f(x)=x2−4x−21f ( x ) = x ^ { 2 } - 4 x - 21f(x)=x2−4x−21

Factor the Function Represented by F (X) and Explain How $f ( x ) = x ^ { 2 } - 4 x - 21$