How do you factor using the difference of two squares

What is the result when you multiply (a + b) by (a - b)?

• a^2 + b^2

• a^2 - b^2

• a^2 + 2ab + b^2

• 2ab

How can you express 4x^2 - 25y^2 using the difference of squares?

• (2x + 5y)^2

• (x + 5y)(x - 5y)

• (4x + 25y)(4x - 25y)

• (2x + 5y)(2x - 5y)

When factoring x^2 - 9, what are the factors?

• (x + 3)(x - 3)

• (x + 9)(x - 9)

• (x + 2)(x - 2)

• (x + 1)(x - 1)

What should you do first when factoring an expression like 2x^2 + 8y^4?

• Use the difference of squares directly

• Apply the quadratic formula

• Factor out the greatest common factor

• Rewrite as a sum of cubes

Which of the following is a valid expression for the difference of squares involving trigonometric functions?

• sin^2(x) - cos^2(x)

• sin(x) + cos(x)

• sin(x) - cos(x)

• sin^2(x) + cos^2(x)