What is the factored form of 7x^2+2x-5?

Question

tkhunny · Answer

There aren't very many factors of either 7 or 5.

(x + ___)(7x - ___)
(x - ___)(7x + ___)

Put 1 and 5 in those blanks and see which combination works.

tkhunny · Answer

Not if you don't show your work.  Did you get the first one?

tkhunny · Answer

Nope.  Note really very close.  7*7 = 49.  Not sure why you think that would be correct.

That IS the simplified form, unless you have written it incorrectly.  Use parentheses to clarify intent.

tkhunny · Answer

No, it isn't.  If it agrees with anything, then that anything is also incorrect.

(7x-5) (7x+1) = 49x^2 - 28x - 5

Does that look ANYTHING like the original expression,  7x^2+2x-5?  No.

tkhunny · Answer

Defensive?  Not even a little.  Books and exams can be incorrect.  It's not that big a deal.  You do not have the factored for of 7x^2 + 2x - 5.

Here is my model:  

x + ___)(7x - ___)
(x - ___)(7x + ___)

Note how the possible outcomes have only one 7.  Yours has two 7s and cannot be correct.

tkhunny · Answer

Good luck with that.  It is incorrect.  So is your fraction.  Add parentheses to indicate numerator and denominator, then it will be correct.