Math Problem Statement

Fungsi y = x^2 + 6x - 8 direfleksikan terhadap garis y = x, sehingga hasil peta dari fungsi tersebut adalah ....

Solution

The problem asks to reflect the function y=x2+6x8y = x^2 + 6x - 8 across the line y=xy = x, and then find the resulting function.

Step-by-step reflection process:

  1. Initial Function: y=x2+6x8y = x^2 + 6x - 8 Here, the goal is to reflect the function across the line y=xy = x. When reflecting a function across the line y=xy = x, we swap the roles of xx and yy, then solve for the new yy.

  2. Swap xx and yy: x=y2+6y8x = y^2 + 6y - 8

  3. Solve for yy (this becomes the new function):

    • Rearrange the equation into standard quadratic form: y2+6y(x+8)=0y^2 + 6y - (x + 8) = 0
    • Use the quadratic formula to solve for yy: y=6±624(1)((x+8))2(1)y = \frac{-6 \pm \sqrt{6^2 - 4(1)(-(x + 8))}}{2(1)} Simplify: y=6±36+4(x+8)2y = \frac{-6 \pm \sqrt{36 + 4(x + 8)}}{2} y=6±36+4x+322y = \frac{-6 \pm \sqrt{36 + 4x + 32}}{2} y=6±68+4x2y = \frac{-6 \pm \sqrt{68 + 4x}}{2} y=6±4(x+17)2y = \frac{-6 \pm \sqrt{4(x + 17)}}{2} y=6±2x+172y = \frac{-6 \pm 2\sqrt{x + 17}}{2} y=3±x+17y = -3 \pm \sqrt{x + 17}
  4. Resulting Functions:

    • The two possible solutions are: y=3+x+17ory=3x+17y = -3 + \sqrt{x + 17} \quad \text{or} \quad y = -3 - \sqrt{x + 17} These are the reflections of the original function across the line y=xy = x.

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Related Questions:

  1. How do you reflect functions across the x-axis or y-axis?
  2. What is the geometric interpretation of reflecting across y=xy = x?
  3. How can we graph the original and reflected functions for better visualization?
  4. How would the reflection look if the original function was cubic?
  5. Can reflection rules be applied to systems of equations?

Tip:

When reflecting a function over the line y=xy = x, always swap the variables and solve for the new function.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Function Reflection

Formulas

Quadratic equation formula: ax^2 + bx + c = 0
Reflection across y = x: Swap x and y, then solve for y

Theorems

Quadratic formula
Function reflection across y = x

Suitable Grade Level

Grades 9-12