<PRE><B>Question 757878</B>
How do I find the product of (5r+4)(5r-4)

(5r + 4)(5r - 4)

5r * 5r = 25r^2

5r * -4 = -20r

4 * 5r = 20r

4 * -4 = -16

Therefore:

25r^2 - 20r + 20r - 16

Combine like terms:

-20r + 20r = 0

25r^2 - 16



Answer:

25r^2 - 16










Lennox Obuong
Algebra Tutor
Nairobi, Kenya
Email: lennoxobuong@yahoo.com</PRE>