Find the X-Intercepts of the Quadratic Function y=(x-6)(x-5)

Quadratic Functions with Factored Form

Determine the points of intersection of the function

y=(x6)(x5) y=(x-6)(x-5)

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 points with the X-axis
00:03 At the intersection points with the X-axis, the Y value must = 0
00:07 Substitute Y = 0 and solve for X values
00:13 Find what makes each factor in the product zero
00:16 This is one solution
00:28 This is the second solution
00:34 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Determine the points of intersection of the function

y=(x6)(x5) y=(x-6)(x-5)

With the X

2

Step-by-step solution

To solve this problem, we'll determine where the graph of the function intersects the x-axis by following these steps:

  • Step 1: Set the function equal to zero: y=(x6)(x5)=0 y = (x-6)(x-5) = 0 .
  • Step 2: Solve for the x-values where the equation equals zero.
  • Step 3: Express these x-values as points where y y is zero, representing the intersections with the x-axis.

Now, let's apply these steps:

Step 1: Set the equation to zero: (x6)(x5)=0 (x-6)(x-5) = 0 .

Step 2: Solve for x x .

  • Set the first factor to zero: x6=0 x-6 = 0 . Solving for x x gives x=6 x = 6 .
  • Set the second factor to zero: x5=0 x-5 = 0 . Solving for x x gives x=5 x = 5 .

Step 3: The solutions represent points on the x-axis where the function intersects.

Thus, the points of intersection are (6,0) (6, 0) and (5,0) (5, 0) .

Therefore, the solution to the problem is (6,0),(5,0)(6,0),(5,0).

3

Final Answer

(6,0),(5,0) (6,0),(5,0)

Key Points to Remember

Essential concepts to master this topic
  • Rule: X-intercepts occur where y equals zero on the graph
  • Technique: Set each factor to zero: (x-6)=0 gives x=6
  • Check: Substitute back: (6-6)(6-5) = 0×1 = 0 ✓

Common Mistakes

Avoid these frequent errors
  • Writing intercepts with wrong coordinates
    Don't write x-intercepts as (0,5) and (0,6) = points on y-axis instead! These would be y-intercepts. Always write x-intercepts as (x-value, 0) where y is zero.

Practice Quiz

Test your knowledge with interactive questions

The following function has been graphed below:

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

Calculate points A and B.

BBBAAACCC

FAQ

Everything you need to know about this question

Why do x-intercepts always have y-coordinate of 0?

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X-intercepts are where the graph crosses the x-axis. Since the x-axis is the line y = 0, any point on it must have a y-coordinate of 0!

How is this different from finding y-intercepts?

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For y-intercepts, you set x = 0 and solve for y. For x-intercepts, you set y = 0 and solve for x. They're opposite processes!

What if the function wasn't already factored?

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You'd need to factor the quadratic first, then set each factor equal to zero. Factored form like (xa)(xb) (x-a)(x-b) makes finding x-intercepts much easier!

Can a quadratic have more than 2 x-intercepts?

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No! A quadratic function can have at most 2 x-intercepts, exactly 1, or none at all. This one has exactly 2 since both factors give different x-values.

Why do we set the equation equal to zero?

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We want to find where the graph crosses the x-axis, which means where y = 0. Setting the function equal to zero gives us those special x-values!

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