Math Problem Statement

Determine g(x−1)g(x−1) for the following function.  

g(x)=−5x^2+6x+7

Solution

To determine g(x1)g(x-1) for the function g(x)=5x2+6x+7g(x) = -5x^2 + 6x + 7, substitute x1x-1 for xx in the original function.

Given: g(x)=5x2+6x+7g(x) = -5x^2 + 6x + 7

  1. Substitute x1x-1 in place of xx: g(x1)=5(x1)2+6(x1)+7g(x-1) = -5(x-1)^2 + 6(x-1) + 7

  2. Expand each term:

    • Start with (x1)2(x-1)^2: (x1)2=x22x+1(x-1)^2 = x^2 - 2x + 1
    • Substitute into g(x1)g(x-1): g(x1)=5(x22x+1)+6(x1)+7g(x-1) = -5(x^2 - 2x + 1) + 6(x - 1) + 7
  3. Distribute and simplify: g(x1)=5x2+10x5+6x6+7g(x-1) = -5x^2 + 10x - 5 + 6x - 6 + 7

  4. Combine like terms: g(x1)=5x2+16x4g(x-1) = -5x^2 + 16x - 4

Thus, g(x1)=5x2+16x4g(x-1) = -5x^2 + 16x - 4.

Would you like further details or have any questions?


Here are some related questions to further your understanding:

  1. How would you find g(x+1)g(x+1) for this function?
  2. What happens to the graph of g(x)g(x) when we find g(x1)g(x-1)?
  3. Can we generalize the process for any polynomial function f(x)f(x)?
  4. How does substitution affect the range of g(x)g(x)?
  5. What is the derivative of g(x1)g(x-1) with respect to xx?

Tip: When substituting xx with xkx - k in a function, the graph shifts horizontally by kk units.

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Math Problem Analysis

Mathematical Concepts

Function Transformation
Substitution
Quadratic Functions

Formulas

Substitution: f(x - k) results in a horizontal shift by k units
Expanding binomials: (x-1)^2 = x^2 - 2x + 1

Theorems

None applicable

Suitable Grade Level

Grades 9-11