Question 418622

16x^2 - 25 


It is a difference of two squares, in the form a^2 - b^2
- it factors into the form (a + b)(a - b)


If a^2 = 16x^2.....a = 4x {took square root}
If b^2 = 25........b = 5 {took square root}


16x^2 - 25
= (4x + 5)(4x - 5)
<a href = "http://www.algebrahouse.com/" target = "_blank">www.algebrahouse.com</a>