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How do you plot y = x^2 + 2x + 1?

To plot the equation y=x2+2x+1y = x^2 + 2x + 1, we will create a table of values and then draw the corresponding points on a graph.

First, let’s analyze the equation y=x2+2x+1y = x^2 + 2x + 1. This is a quadratic equation, which means its graph will be a parabola. The general form of a quadratic equation is given by:

y=ax2+bx+c,y = ax^2 + bx + c,

where in this case, we have a=1a = 1, b=2b = 2, and c=1c = 1.

Next, we will create a table of values to assist in plotting the graph. We will select a range of xx values that include both negative and positive numbers and calculate the corresponding yy values. Here’s the table:

\begin{array}{c|c} x & y = x^2 + 2x + 1 \ \hline -3 & (-3)^2 + 2(-3) + 1 = 9 - 6 + 1 = 4 \ -2 & (-2)^2 + 2(-2) + 1 = 4 - 4 + 1 = 1 \ -1 & (-1)^2 + 2(-1) + 1 = 1 - 2 + 1 = 0 \ 0 & (0)^2 + 2(0) + 1 = 0 + 0 + 1 = 1 \ 1 & (1)^2 + 2(1) + 1 = 1 + 2 + 1 = 4 \ 2 & (2)^2 + 2(2) + 1 = 4 + 4 + 1 = 9 \ \end{array}

Now, we can plot these points on a graph with an xx-axis and a yy-axis. The points to plot are as follows: (3,4)(-3, 4), (2,1)(-2, 1), (1,0)(-1, 0), (0,1)(0, 1), (1,4)(1, 4), and (2,9)(2, 9).

Once you have plotted these points, draw a smooth curve connecting them. You will observe that the graph forms a U-shaped parabola that opens upwards. The vertex of this parabola, which represents its lowest point, is located at the coordinates (1,0)(-1, 0). This can be confirmed by rewriting the equation in vertex form as follows:

y=(x+1)2.y = (x + 1)^2.

This shows that the vertex occurs at x=1x = -1, confirming that the lowest point of the parabola is indeed at (1,0)(-1, 0).

Answered by: Dr. Sarah Wilson
GCSE Physics Tutor
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Our families consistently gain offers from at least one of their target schools, including Eton, Harrow, Wellington and Wycombe Abbey.

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