Math Problem Statement

Re-write the quadratic function below in Standard Form

y, equals, minus, 2, left parenthesis, x, minus, 6, right parenthesis, squared, plus, 5

y=

−2(x−6)2+5

Solution

To rewrite the quadratic function y=2(x6)2+5y = -2(x - 6)^2 + 5 in standard form, we need to expand the expression and simplify it. The standard form of a quadratic function is:

y=ax2+bx+cy = ax^2 + bx + c

Here’s how we can do it step by step:

  1. Expand the square:
    (x6)2=(x6)(x6)=x212x+36(x - 6)^2 = (x - 6)(x - 6) = x^2 - 12x + 36

  2. Multiply by -2:
    2(x212x+36)=2x2+24x72-2(x^2 - 12x + 36) = -2x^2 + 24x - 72

  3. Add the constant 5:
    y=2x2+24x72+5y = -2x^2 + 24x - 72 + 5

  4. Simplify the constants:
    y=2x2+24x67y = -2x^2 + 24x - 67

So, the quadratic function in standard form is:

y=2x2+24x67y = -2x^2 + 24x - 67

Let me know if you need more details or have any questions!

Follow-up Questions:

  1. What does the "vertex form" of a quadratic function represent?
  2. How do you find the vertex of a parabola given its standard form?
  3. How would the graph change if the coefficient of x2x^2 were positive instead of negative?
  4. How do you determine the axis of symmetry from the standard form?
  5. What is the significance of the constant term in a quadratic function?

Tip: To quickly find the vertex of a quadratic in standard form, use the formula x=b2ax = \frac{-b}{2a}, where aa and bb are the coefficients from y=ax2+bx+cy = ax^2 + bx + c.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Functions
Standard Form
Vertex Form

Formulas

Standard form of a quadratic function: y = ax^2 + bx + c
Formula for expanding a binomial: (x - h)^2 = x^2 - 2hx + h^2

Theorems

Distributive property
Simplification of constants

Suitable Grade Level

Grades 8-10