Factor by grouping. 7x(5x-5)-1(7x-1)

Question

anonymous · Answer

is it...35x^2 - 42x + 1??!!

anonymous · Answer

but, you're supposed to factor it not simplify aren't you ?

anonymous · Answer

yes..

anonymous · Answer

(7x-1)(7x-1)......no?

anonymous · Answer

http://www.wolframalpha.com/input/?i=35x^2-42x-1 That has ugly roots ...

anonymous · Answer

are you sure it's written correctly ?

anonymous · Answer

hmm 35x^2-32x+5=

anonymous · Answer

I mean is the original question written correctly ? See the ugly roots we got for it ? http://www.wolframalpha.com/input/?i=7x%285x-5%29-1%287x-1%29

anonymous · Answer

original question is that problem.

anonymous · Answer

thanks for trying, i must of had goofed somewhere in the problem.

anonymous · Answer

but homework is past due now so oh well...XD maybe i'll figure it out later.

anonymous · Answer

http://calculator.tutorvista.com/math/472/factor-by-grouping-calculator.html

anonymous · Answer

was that question from a text book ? or a site ?

anonymous · Answer

math program

anonymous · Answer

there were three steps to it I had to answer..I think I messed up on the question factor part

anonymous · Answer

but this question came from that program ?
factor by grouping: 7x(5x-5)-1(7x-1)

anonymous · Answer

no that's the problem that I got from trying to factor by grouping.

anonymous · Answer

original problem is the 35 one

anonymous · Answer

This is the original ?
35x^2 - 42x + 1

anonymous · Answer

35x^2-32x+5

anonymous · Answer

that comes out weird too :(

anonymous · Answer

odd....maybe it's a mistake from the program. let me double check what the problem is

anonymous · Answer

yeah it told me to complete the parts below to factor that problem by grouping, first part was finding the two numbers who's product is 35.3=173 and whose sum is -32. I got -25, and -7,  and then it ask me to write -32x using the factors so it was -25x-7x, and then it told me to factor by grouping, and dats when I messed up.

anonymous · Answer

(-25)*(-7) = 135

anonymous · Answer

yeah

anonymous · Answer

isnt it :
x^2-32x+135
?

anonymous · Answer

i have no idea..my brain is fried. XD I got everything write but the factoring part.

anonymous · Answer

x^2-32x+135 = (x-5)(x-27)

anonymous · Answer

actually :

(-25)*(-7) = 175

x^2-32x+175 = (x-25)(x-7)

anonymous · Answer

but it's too late anyway ...

anonymous · Answer

yeah, my fault for not starting it sooner..can't blame anything but myself XD

anonymous · Answer

I have to go, thanks for the big help. bye bye