Chapter 9: Problem 1
Change the following quadratic equations into standard form. $$ x^{2}+4 x=-6 $$
Short Answer
Expert verified
The standard form of the equation is: x^2 + 4x + 6 = 0.
Step by step solution
01
Identify the given equation
Recognize that the given equation is not in standard form. The equation provided is:displayx^2 + 4x = -6.
02
Move the constant term to the right side
To convert the equation into standard form, move the constant term on the right-hand side to the left-hand side. This is done by adding 6 to both sides of the equation:x^2 + 4x + 6 = 0.
03
Verify the standard form
Ensure that the equation is now in the form ax^2 + bx + c = 0.Here, you can see that the equation is x^2 + 4x + 6 = 0,which matches the standard form.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
standard form of quadratic equation
A quadratic equation is generally expressed in the form of: \[ax^2 + bx + c = 0\]. This format is known as the standard form of a quadratic equation. The coefficients are:
Here, an example equation is given:
\[x^2 + 4x = -6\]
As you can see, the equation features an \(x^2\) term and an \(x\) term, but it also has a constant term on the right-hand side. To transform this into standard form, you must gather all terms on one side and arrange them in decreasing powers of \(x\). This results in the equation:
\[x^2 + 4x + 6 = 0\]
Now the equation fits the standard form \(ax^2 + bx + c = 0\).
- \(a\) - the coefficient of \(x^2\)
- \(b\) - the coefficient of x
- \(c\) - the constant term
Here, an example equation is given:
\[x^2 + 4x = -6\]
As you can see, the equation features an \(x^2\) term and an \(x\) term, but it also has a constant term on the right-hand side. To transform this into standard form, you must gather all terms on one side and arrange them in decreasing powers of \(x\). This results in the equation:
\[x^2 + 4x + 6 = 0\]
Now the equation fits the standard form \(ax^2 + bx + c = 0\).
solving quadratic equations
There are several methods to solve quadratic equations once they are in standard form. These methods include:
- Factoring: This involves writing the quadratic equation as a product of its factors. It's the simplest method but doesn’t always work if the equation isn’t easily factorable.
- Quadratic Formula: For any quadratic equation \(ax^2 + bx + c = 0\), the solutions can be found using the formula \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\).
- Completing the Square: This method involves rewriting the equation in the form \((x + p)^2 = q\) and then solving for \(x\).
algebra steps
Algebra steps are crucial when manipulating quadratic equations to ensure all transformations are correct. Following these steps can simplify complex algebraic problems:
- **Step 1: Identify and Rearrange** - Always start by identifying the quadratic equation. Rearrange it into standard form if necessary.
- **Step 2: Collect Like Terms** - Combine like terms and ensuring the equation is balanced on both sides.
- **Step 3: Apply Solving Techniques** - Use suitable techniques like factoring, completing the square, or the quadratic formula.
- **Step 4: Verify Solutions** - Substitute the solutions back into the original equation to verify correctness.