SOLUTION: Hello good sir, I have a kunundrum about these equations... how do i factor these fully x2-81 , x2-25=0 , and x2-2x-15=0 thank you kind samaritan for doing this, and if

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Hello good sir, I have a kunundrum about these equations... how do i factor these fully x2-81 , x2-25=0 , and x2-2x-15=0 thank you kind samaritan for doing this, and if      Log On


   

Question 25346: Hello good sir,
I have a kunundrum about these equations...
how do i factor these fully
x2-81 , x2-25=0 , and x2-2x-15=0
thank you kind samaritan for doing this, and if u finish these for me u shall earn a seat at my round table.
Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
x2-81
I think this one also is suppose to equal 0?
x%5E2-81=0
(x-9)(x+9)=0
x-9=0
x=9
x+9=0
x=-9
x2-25=0
(x-5)(x+5)=0
x-5=0
x=5
x+5=0
x=-5
x2-2x-15=0
(x-5)(x+3)=0
x-5=0
x=5
x+3=0
x=-3
Hope you understand
=)
P.S. We are not all sirs, do I still earn a seat at your round table?