Posted by **sam** on Sunday, February 13, 2011 at 9:54pm.

Megan factored the expression (-12x^2+52x-35) as (-2x+5)(6x-7) but when Jacob applied FOIL principle and multiplied out (2x+5)(6x-7) he got (-12x^2+44x-35),thus megan's solution does not appear to check please help megan to understand better.Explain your reasoning and correctly factor the original expression if possible If the expression is a prime please state so

- algebra -
**Reiny**, Sunday, February 13, 2011 at 10:13pm
First of all I changed it into

- (12x^2 - 52x + 35)

After 4 tries I had

- (2x-7)(6x-5) or (7-2x)(6x-5) or (2x-7)(5-6x)

(I use a method where I list the factors of the first and last numbers, and then take sum or differences of cross-products

e.g.

3 **2** 1 ....... 5 **7**

4 **6** 12 ...... 7 **5**

2x5 + 6x7 = 52, my middle term

This is the fastest way to factor trinomials, too bad nobody seems to teach this method any more.

- algebra -
**sam**, Sunday, February 13, 2011 at 10:17pm
I came up with -(6x-5)(2x-7)

- algebra -
**Reiny**, Sunday, February 13, 2011 at 10:55pm
yes,

that was my first answer I gave you.

surely you realize that

-(6x-5)(2x-7) = - (2x-7)(6x-5)

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