How do you factor 12x2 18x 21?

Answer 1

We have the algebraic expression: 12x2 - 18x - 21

First multiply coefficient of x2 with -21. The result is -21 x 12 = -252.

Now, break down coefficient of x into two numbers such that their product is -252.

-18 can't be broken into two numbers such that their product is -252.

So, 12x2 - 18x - 21 can't be factorized.

Another Answer:-

It appears that the above quadratic expression can be factored because its discriminant is greater than zero.

12x2-18x-21

Divide all terms by 3:

4x2-6x-7 = (4x+3.08276253)(x-2.2706906326) when factored correct to 8 and 10 decimal places respectively

Answer 2

Assuming the missing signs are pluses, that factors to 3(4x^2 + 6x + 7)