Math Problem Statement

For what values of m does the graph of y = mx2 – 5x – 2 have no x-intercepts?

Solution

To determine for what values of mm the graph of the quadratic equation y=mx25x2y = mx^2 - 5x - 2 has no x-intercepts, we need to analyze the discriminant of the quadratic equation.

The quadratic equation is of the form y=ax2+bx+cy = ax^2 + bx + c, where:

  • a=ma = m
  • b=5b = -5
  • c=2c = -2

The discriminant Δ\Delta of a quadratic equation ax2+bx+c=0ax^2 + bx + c = 0 is given by: Δ=b24ac\Delta = b^2 - 4ac

In our case: Δ=(5)24(m)(2)\Delta = (-5)^2 - 4(m)(-2) Δ=25+8m\Delta = 25 + 8m

For the quadratic to have no x-intercepts, the discriminant must be less than zero: 25+8m<025 + 8m < 0

Solving for mm: 8m<258m < -25 m<258m < -\frac{25}{8}

Thus, the graph of y=mx25x2y = mx^2 - 5x - 2 will have no x-intercepts for m<258m < -\frac{25}{8}.


Would you like more details on any part of this solution or additional clarification?

Here are five related questions you may find helpful:

  1. What happens when m=258m = -\frac{25}{8}?
  2. How does the discriminant relate to the number of x-intercepts?
  3. For what values of mm does the quadratic have exactly one x-intercept?
  4. Can you graph the equation for a specific value of mm to visualize it?
  5. How does the value of mm affect the shape of the parabola?

Tip: If the discriminant is zero, the quadratic will have exactly one real solution, meaning the parabola touches the x-axis at one point.

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Math Problem Analysis

Mathematical Concepts

Quadratic Equations
Discriminant
Parabolas

Formulas

Discriminant formula Δ = b^2 - 4ac
General form of quadratic equation y = ax^2 + bx + c

Theorems

Discriminant Theorem
Properties of Parabolas

Suitable Grade Level

Grades 9-11