SOLUTION: Use the difference of two squares formula to factor. Be sure to factor out any common factors. y^2 - 49, 4x^2 - 25 and 81x^2 - 1

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Use the difference of two squares formula to factor. Be sure to factor out any common factors. y^2 - 49, 4x^2 - 25 and 81x^2 - 1      Log On


   

Question 255006: Use the difference of two squares formula to factor. Be sure to factor out any common factors.
y^2 - 49, 4x^2 - 25 and 81x^2 - 1
Answer by palanisamy(496) About Me  (Show Source):
You can put this solution on YOUR website!
1) y^2-49 = y^2-7^2
= (y+7)(y-7)
2) 4x^2-25= (2x)^2-5^2
= (2x+5)(2x-5)
3) 81x^2-1 = (9x)^2-1^2
= (9x+1)(9x-1)