Gustavo was asked to solve 64x^2+9=13

by factoring using the difference of squares pattern. What is/are the correct solution(s)?

1 answer

To solve the equation \( 64x^2 + 9 = 13 \) by factoring using the difference of squares pattern, we first need to rearrange the equation in a standard form.

Start by moving the constant term on the right side of the equation to the left side:

\[ 64x^2 + 9 - 13 = 0 \] which simplifies to: \[ 64x^2 - 4 = 0 \]

Now, we can factor this expression. Notice that we can rewrite \( 4 \) as \( 2^2 \):

\[ 64x^2 - 4 = (8x)^2 - (2)^2 \]

This is a difference of squares, which can be factored as follows:

\[ (a^2 - b^2) = (a - b)(a + b) \]

Here, \( a = 8x \) and \( b = 2 \). Thus we can factor it into:

\[ (8x - 2)(8x + 2) = 0 \]

Next, we set each factor equal to zero to find the solutions:

  1. \( 8x - 2 = 0 \) \[ 8x = 2 \quad \Rightarrow \quad x = \frac{2}{8} = \frac{1}{4} \]

  2. \( 8x + 2 = 0 \) \[ 8x = -2 \quad \Rightarrow \quad x = \frac{-2}{8} = -\frac{1}{4} \]

Thus, the solutions to the equation \( 64x^2 + 9 = 13 \) are:

\[ x = \frac{1}{4} \quad \text{and} \quad x = -\frac{1}{4}. \]