Family of Parabolas y=(x-p)²

🏆Practice parabola of the form y=(x-p)²

Family of Parabolas y=(xp)2y=(x-p)^2

In this family, we have a slightly different quadratic function that shows us, very clearly, how the parabola shifts horizontally.
PP indicates the number of steps the parabola will move horizontally, to the right or to the left.
If PP is positive: (there is a minus sign in the equation) - The parabola will move PP steps to the right.
If PP is negative: (and, consequently, there will be a plus sign in the equation since minus by minus equals plus) - The parabola will move PP steps to the left.

Let's see an example:
The function  Y=(X+2)2 Y=(X+2)^2

shifts two steps to the left.
Let's see it in an illustration:

1 - The function   Y=(X+2)^2


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Test yourself on parabola of the form y=(x-p)²!

Find the intersection of the function

\( y=(x+4)^2 \)

With the Y

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Change in Slope

When there is an aa before the parentheses, it indicates the slope of the parabola.
The larger the aa, the closer the parabola will be to its axis of symmetry. Steeper - with a smaller opening.
The smaller the aa, the farther the parabola will be from its axis of symmetry. Less steep - with a larger opening.

Let's see an example that shows the balance between the change in slope and horizontal shift:
For example, in the function 

Y=12(X2)2Y=\frac{1}{2} (X-2)^2

the changes will be:
Shift of 22 steps to the right
and the change in slope, The parabola will be less steep and with a larger opening
Let's see it in an illustration:

2 - Shift of 2 steps to the right


Graphical and Algebraic Solution when y=0y=0

Algebraic Solution

when y=0y=0 the expression inside parentheses must be equal to 0 0 .
XX must be equal to PP for the equation to be correct.


Graphical Solution

The graphical solution is the vertex of the parabola.
In a quadratic function of this form 
Y=(Xp)2Y=(X-p)^2
in which the coefficient of X2X^2  is 11,
the vertex of the parabola is composed ofY=0 Y=0  and byPP which indicates the XX vertex.
(0,P)(0,P)
Note that, when in the equation there is a minus sign before thePP
indeed, it is positive and, when there is a plus sign before the PP it is, in fact, negative.


Examples and exercises with solutions from the family of parabolas y=(x-p)²

Exercise #1

Find the intersection of the function

y=(x2)2 y=(x-2)^2

With the X

Video Solution

Step-by-Step Solution

To solve this problem, we'll find the intersection of the function y=(x2)2 y = (x-2)^2 with the x-axis. The x-axis is characterized by y=0 y = 0 . Hence, we set (x2)2=0 (x-2)^2 = 0 and solve for x x .

Let's follow these steps:

  • Step 1: Set the function equal to zero:

(x2)2=0 (x-2)^2 = 0

  • Step 2: Solve the equation for x x :

Taking the square root of both sides gives x2=0 x - 2 = 0 .

Adding 2 to both sides results in x=2 x = 2 .

  • Step 3: Find the intersection point coordinates:

The x-coordinate is x=2 x = 2 , and since it intersects the x-axis, the y-coordinate is y=0 y = 0 .

Therefore, the intersection point of the function with the x-axis is (2,0)(2, 0).

The correct choice from the provided options is (2,0) (2, 0) .

Answer

(2,0) (2,0)

Exercise #2

Find the intersection of the function

y=(x+4)2 y=(x+4)^2

With the Y

Video Solution

Step-by-Step Solution

To solve this problem, we will find the intersection of the function with the Y-axis by following these steps:

  • Step 1: Recognize that the intersection with the Y-axis occurs where x=0 x = 0 .
  • Step 2: Substitute x=0 x = 0 into the function y=(x+4)2 y = (x+4)^2 .
  • Step 3: Perform the calculation to find the y-coordinate.

Now, let's solve the problem:

Step 1: Identify the Y-axis intersection by setting x=0 x = 0 .
Step 2: Substitute x=0 x = 0 into the function:

y=(0+4)2=42=16 y = (0+4)^2 = 4^2 = 16

Step 3: The intersection point on the Y-axis is (0,16)(0, 16).

Therefore, the solution to the problem is (0,16)(0, 16).

Answer

(0,16) (0,16)

Exercise #3

Find the ascending area of the function

y=(x3)2 y=(x-3)^2

Video Solution

Step-by-Step Solution

To determine where the function y=(x3)2 y = (x-3)^2 is increasing, consider the following:

  • The function is a parabola that opens upwards, centered at the vertex x=3 x = 3 .
  • A parabola of the form y=(xp)2 y = (x-p)^2 is increasing on the interval x>p x > p .

This means the function y=(x3)2 y = (x-3)^2 begins to increase after the vertex, which is at x=3 x = 3 .

Thus, the area of increase (or ascending area) for this function is when x>3 x > 3 .

Therefore, the correct answer is 3<x 3 < x .

Answer

3 < x

Exercise #4

Find the descending area of the function

y=(x+5)2 y=(x+5)^2

Video Solution

Step-by-Step Solution

To solve this problem, we will determine when the function y=(x+5)2 y = (x+5)^2 is decreasing by using its derivative:

  • Step 1: Differentiate y=(x+5)2 y = (x+5)^2 with respect to x x , yielding dydx=2(x+5) \frac{dy}{dx} = 2(x+5) .
  • Step 2: Set the derivative less than zero: 2(x+5)<0 2(x+5) < 0 .
  • Step 3: Simplify the inequality to solve for x x :
    x+5<0 x + 5 < 0 implies x<5 x < -5 .

The function is decreasing for values of x x that satisfy x<5 x < -5 .

Therefore, the solution is x<5 x < -5 .

Answer

x < -5

Exercise #5

Find the negative area of the function

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

Video Solution

Step-by-Step Solution

The function y=(x+2)2 y = (x+2)^2 describes a parabola that opens upwards and has its vertex at (2,0) (-2, 0) . Since the equation involves a perfect square, it yields only non-negative values for all x x and always lies on or above the x-axis. Therefore, there is no part of this parabola that crosses below the x-axis, resulting in no "negative area" above or below the x-axis.

In conclusion, the correct answer among the choices is: There is no negative area.

Answer

There is no

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