SOLUTION: How to I factor this problem completely? x^2-18x+81

Question 622278: How to I factor this problem completely?
x^2-18x+81
Found 2 solutions by solver91311, matineesuxxx:
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

Use FOIL in reverse. Hint: -9 times -9 is 81.

John

My calculator said it, I believe it, that settles it

Answer by matineesuxxx(27) (Show Source): You can put this solution on YOUR website!
what two numbers multiply together to give you +81 yet add together to give you -18? the answer is -9. so this equation becomes,

well now you can factor out an x from the first bracket and -9 from the second bracket and you will get,

now (x-9) is a common factor. so the equation becomes,

this is a perfect square, so it is now written as,

hope this helps!
RELATED QUESTIONS
factor completely:... (answered by Alan3354)
Factor... (answered by jim_thompson5910)
factor... (answered by jim_thompson5910)
Factor x^4 - 18x^2 +... (answered by Nate)
3x^2+2x-18x-12 i can not figure out how to factor this... (answered by jim_thompson5910)
I need help with this: x^2=18x - 81... (answered by ankor@dixie-net.com)
Factor completely: 5x squared + 90x + 405 I'm not sure how to get this solved... (answered by solver91311)
I need to know how to factor this problem and show my work: 18x^2 - 27x +... (answered by fanism)
Says to factor completely... (answered by solver91311)