Math Problem Statement

The equation of the curve is y = x^2 + ax + b, where a and b are integers. The points (0, -5) and (5, 0) lie on the curve. Find the coordinates of the turning point of the curve.

Solution

The problem presented is about finding the turning point of a quadratic curve. Let's break it down.

Problem details:

  • The equation of the curve is given by y=x2+ax+by = x^2 + ax + b, where aa and bb are integers.
  • Two points on the curve are given: (0,5)(0, -5) and (5,0)(5, 0).
  • We are asked to find the coordinates of the turning point of the curve.

Steps to solve:

  1. Substitute the points into the equation to find aa and bb:

    For (0,5)(0, -5), substitute x=0x = 0 and y=5y = -5 into the equation: 5=02+a(0)+b    b=5.-5 = 0^2 + a(0) + b \implies b = -5.

    Now, for (5,0)(5, 0), substitute x=5x = 5 and y=0y = 0: 0=52+a(5)5    0=25+5a5    5a=20    a=4.0 = 5^2 + a(5) - 5 \implies 0 = 25 + 5a - 5 \implies 5a = -20 \implies a = -4.

  2. Rewrite the equation of the curve: The equation now becomes: y=x24x5.y = x^2 - 4x - 5.

  3. Find the turning point: The turning point of a quadratic function y=x2+ax+by = x^2 + ax + b occurs at x=a2x = -\frac{a}{2}.

    Here, a=4a = -4, so: x=42=2.x = -\frac{-4}{2} = 2.

    To find the yy-coordinate of the turning point, substitute x=2x = 2 into the equation y=x24x5y = x^2 - 4x - 5: y=224(2)5=485=9.y = 2^2 - 4(2) - 5 = 4 - 8 - 5 = -9.

Final Answer:

The turning point of the curve is at (2,9)(2, -9).

Would you like more details on this, or do you have any questions?

Here are 5 related questions you might want to explore:

  1. How do we determine the axis of symmetry for a quadratic equation?
  2. What is the significance of the discriminant in quadratic equations?
  3. How would the curve shift if the values of aa or bb changed?
  4. How do you find the roots of the quadratic equation y=x24x5y = x^2 - 4x - 5?
  5. What is the general form of the vertex form of a quadratic equation?

Tip: The vertex (or turning point) of any quadratic equation y=ax2+bx+cy = ax^2 + bx + c can also be found by completing the square!

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Math Problem Analysis

Mathematical Concepts

Quadratic Functions
Turning Points
Algebra

Formulas

y = x^2 + ax + b
x-coordinate of turning point = -a/2

Theorems

Properties of Quadratic Functions

Suitable Grade Level

Grades 9-10