Determine Intersection Points of y = (x + 8)(x - 9) on the X-Axis

Determine the points of intersection of the function

y=(x+8)(x9) y=(x+8)(x-9)

With the X

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the intersection point with the X-axis
00:03 At the intersection point with the X-axis, the Y value must = 0
00:07 Let Y = 0 and solve for X values
00:13 Find what makes each factor equal zero
00:17 This is one solution
00:29 This is the second solution
00:35 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Determine the points of intersection of the function

y=(x+8)(x9) y=(x+8)(x-9)

With the X

2

Step-by-step solution

The solution to the problem involves finding the x-intercepts of the given quadratic function, which are the points where the function intersects the x-axis (i.e., where y=0 y = 0 ).

Step by step solution:

  • Set the function equal to zero: (x+8)(x9)=0 (x+8)(x-9) = 0 .
  • The product of two terms is zero if and only if at least one of the terms is zero. Therefore, we solve:
    x+8=0 x+8 = 0 or x9=0 x-9 = 0 .
  • For x+8=0 x+8 = 0 :
    Subtract 8 from both sides to isolate x x :
    x=8 x = -8 .
  • For x9=0 x-9 = 0 :
    Add 9 to both sides to isolate x x :
    x=9 x = 9 .

The function intersects the x-axis at the points (8,0)(-8, 0) and (9,0)(9, 0).

Therefore, the points of intersection of the function with the x-axis are (8,0)(-8, 0) and (9,0)(9, 0).

3

Final Answer

(8,0),(9,0) (-8,0),(9,0)

Practice Quiz

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The following function has been graphed below:

\( f(x)=-x^2+5x+6 \)

Calculate points A and B.

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