Understanding the Quadratic Equation: 16x² - 40x + 25

Solving quadratic equations is a fundamental skill in algebra, and one expression that exemplifies key concepts in quadratic analysis is 16x² - 40x + 25. Whether you're a student, educator, or math enthusiast, understanding this equation’s structure, solutions, and applications can enhance your problem-solving abilities. In this SEO-optimized article, we’ll explore everything you need to know about 16x² - 40x + 25, including factoring, the quadratic formula, vertex form, and real-world applications.

What is the Equation 16x² - 40x + 25?

Understanding the Context

The expression 16x² - 40x + 25 is a quadratic trinomial in the standard form:

ax² + bx + c, where a = 16, b = -40, and c = 25.

Quadratic equations of this form appear frequently in algebra, physics, engineering, and economics, making familiarity with them essential. The discriminant, b² - 4ac, helps determine the nature of the roots—whether real and distinct, real and repeated, or complex.

Step 1: Determine the Type of Quadratic Using the Discriminant

Key Insights

Calculate the discriminant:

> D = b² - 4ac = (-40)² - 4(16)(25) = 1600 - 1600 = 0

Since D = 0, the equation has exactly one real root (a repeated root), meaning the parabola touches the x-axis at its vertex.

Factoring the Quadratic Expression

Because the discriminant is zero, a perfect square trinomial is likely. Let's check if 16x² - 40x + 25 factors nicely:

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Final Thoughts

Try factoring:

We seek two binomials of the form (mx + n)² = m²x² + 2mnx + n²

From the equation:

First term: 16x² → m² = 16 ⇒ m = 4
Last term: 25 = 5²
Middle term: 2mnx = -40x

Try m = 4, n = -5:

2mn = 2(4)(-5) = -40 ⇒ matches!

So,

16x² - 40x + 25 = (4x - 5)²

This perfect square form reveals the vertex and simplifies graphing.

Solving for x: Finding the Root

Set the factored expression equal to zero: