You can put this solution on YOUR website! 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