Which of the following is a point on the graph as described by the function y=(2x+1)^2−4

?(1 point)
Responses

(1,2)
left parenthesis 1 comma 2 right parenthesis

(−1,−3)
left parenthesis negative 1 comma negative 3 right parenthesis

(−1,−5)
left parenthesis negative 1 comma negative 5 right parenthesis

(0,−2)
left parenthesis 0 comma negative 2 right parenthesis

1 answer

To determine which of the listed points is on the graph of the function \( y = (2x + 1)^2 - 4 \), we can evaluate the function for each x-coordinate and check which corresponding y-value matches.

  1. For the point \( (1, 2) \): \[ y = (2(1) + 1)^2 - 4 = (2 + 1)^2 - 4 = 3^2 - 4 = 9 - 4 = 5 \] So \( (1, 2) \) is not a point on the graph.

  2. For the point \( (-1, -3) \): \[ y = (2(-1) + 1)^2 - 4 = (-2 + 1)^2 - 4 = (-1)^2 - 4 = 1 - 4 = -3 \] So \( (-1, -3) \) is a point on the graph.

  3. For the point \( (-1, -5) \): Using the previous calculation, we already found \( y = -3 \) when \( x = -1 \). So \( (-1, -5) \) is not on the graph.

  4. For the point \( (0, -2) \): \[ y = (2(0) + 1)^2 - 4 = (0 + 1)^2 - 4 = 1^2 - 4 = 1 - 4 = -3 \] So \( (0, -2) \) is not a point on the graph.

The only point from the list that lies on the graph of the function is:

\(-1, -3\)