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91Ó°ÊÓ

Solve each equation by factoring using integers, if possible. If an equation can't be solved in this way, explain why. $$ g^{2}+64=16 g $$

Short Answer

Expert verified
g = 8

Step by step solution

01

- Rewrite the equation

Start by moving all terms to one side of the equation to set it equal to zero: \(g^2 + 64 = 16g\)Subtract 16g from both sides: \(g^2 - 16g + 64 = 0\)
02

- Factor the quadratic equation

Factor the quadratic equation \(g^2 - 16g + 64\). Notice this is a perfect square trinomial. It can be factored as:\((g - 8)(g - 8) = 0\)or\((g - 8)^2 = 0\)
03

- Solve for g

Set each factor equal to zero:\(g - 8 = 0\)Solve for \(g\):\(g = 8\)

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Perfect Square Trinomial
A perfect square trinomial is a special kind of quadratic expression that can be factored into a square of a binomial. This makes solving quadratic equations easier.

For example, in our exercise, the quadratic equation is given as:

[g^2 - 16g + 64 = 0ewline]

Notice that both the first term, [g^2ewline], and the last term, [64ewline], are perfect squares. They are [g^2ewline] and [8^2ewline], respectively. So, the equation can be written using these squares:

[(g - 8)^2 = 0ewline]

This is a perfect square trinomial because it is the square of the binomial [(g-8)ewline]. Recognizing perfect square trinomials can simplify the factoring process, as you can directly factor them into the square of a binomial.
Solving Quadratic Equations
Solving quadratic equations involves finding the values of the variable that make the equation true. After factoring the equation, we'll have something like this:

[(g - 8)^2 = 0ewline]

To solve for [gewline], we can set each factor equal to zero:

[(g - 8) = 0ewline]

This simplest equation can now be solved as:

[g - 8 = 0ewline]
[g = 8ewline]

Hence, the solution to the quadratic equation is [g = 8ewline].

Solving quadratic equations might involve different methods such as factoring, using the quadratic formula, completing the square, or graphing. However, recognizing and factoring a perfect square trinomial simplifies the process significantly.
Factoring Techniques
Factoring techniques are methods used to break down quadratic equations into simpler factors. Common techniques include:

  • Recognizing perfect square trinomials
  • Using the distributive property
  • Differentiating between common factors
  • Employing special factoring formulas

In our example, we used the recognition of a perfect square trinomial for factoring.

The quadratic equation was

[g^2 - 16g + 64 = 0ewline],

which we factored as:

[(g - 8)^2 = 0ewline].

If it hadn't been a perfect square trinomial, we might have needed to use other methods such as grouping or applying the quadratic formula. Mastering different factoring techniques allows for solving a variety of quadratic equations more effectively.

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