need help solving: 4x^2 +17x -15 =0

[tchanel99]

4x^2 +17x -15 =0

 

[pka]

4x^2 +17x -15 =0

\(\displaystyle 4x^2+17x-15=(4x-?)(x+?)\)

 

[math3210]

Quadratic Equation

Hi!

If you are having a hard time factoring the equation, you can use the Quadratic Formula and substitute the values of a, b and c to the formula.
If ax^2 + bx + c = 0, what are the values of a, b and c?

 

[Deleted member 4993]

4x^2 +17x -15 =0

Please share your work with us .

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/th...217#post322217

 

[lookagain]

\(\displaystyle 4x^2 + 17 x- 15 = (4x - ?)(x + ?)\)

1) You cannot assume whether \(\displaystyle \ 4x^2 \ \)will have to break down into 4x and x, or into 2x and 2x, for the factoring.

2) You cannot assume where the plus and the minus signs go, relative to the x-term factors.





Edit: \(\displaystyle \ \ \)Subhotosh Khan, I would never give a hint with a specific instance of a set-up of factoring as pka did. \(\displaystyle \ \ \ \) All it does is make me think

is that I must determine what those question marks are, given that the user has determined for me that the breakdown of 4x^2 is 2x and 2x.

 

[Deleted member 4993]

1) You cannot assume whether \(\displaystyle \ 4x^2 \ \)will have to break down into 4x and x, or into 2x and 2x, for the factoring.

2) You cannot assume where the plus and the minus signs go, relative to the x-term factors.

I assume, pka was providing hints for this problem - not a general method of solution.