Thank You So Much, I need help factoring the trinomial 25x^3 - 45x^2 +8, I need to factor out all common monomials first, can anyone help? I think I figure it out, but I want to be sure. and I think this is the answer. x(5x + 8)(5x -1)
2007-06-15 21:09:40 · 5 answers · asked by delphiniums 1 in Science & Mathematics ➔ Mathematics
i can't quite remember how to work this problem out but to double check your answer you can solve it again...that is to say multiply everything together again and see if you get the right answer
2007-06-15 21:37:34 · answer #1 · answered by help please? =P 3 · 0⤊ 0⤋
Sorry, but unless you have a typo in
25x^3 - 45x^2 + 8,
the factors are
25(x + 0.382878)(x - 0.495232)(x - 1.687646)
If your expression is
25x^3 - 45x^2 + 8x,
the factors are
x(5x - 8)(5x - 1)
2007-06-16 05:11:49 · answer #2 · answered by Helmut 7 · 0⤊ 0⤋
The correct answer is
x(5x - 8) (5x -1) ==>
(5x^2 - 8x)(5x -1) =
25x^3 -5x^2 - 40x^2 + 8 =
25x^3 - 45x^2 + 8 ==> the original equation
2007-06-16 04:34:54 · answer #3 · answered by detektibgapo 5 · 0⤊ 1⤋
very close...
if you factor out x you have
x(25x^2 - 45x) + 8
then factoring 25x^2 - 45x + 8 using the FOIL method you have
x(5x - 8)(5x -1)
In other words change (5x + 8) to (5x - 8) and you are 100% correct.
Very well done!
2007-06-16 04:30:58 · answer #4 · answered by Anonymous · 0⤊ 1⤋
hi,,
try to go to this sites:
http://www.purplemath.com
http://www.helpalgebra.com
http://www.freemathhelp.com/algebra-help...
http://education.yahoo.com/
2007-06-16 05:50:32 · answer #5 · answered by loveypolly12 2 · 0⤊ 0⤋