Question

20x^2+31x-7?? too confusing, explain how to work it please?

Answer 1

use \[D= (-b \pm \sqrt{b ^{2}-4ac})/2a\]

Answer 2

agreed.

Answer 3

i'm not solving for D though? it's factoring trinomials so that doesn't make sense to solve for D?

Answer 4

So the question is: "factor 20^2+31x-7"?

Answer 5

yes

Answer 6

\[D= (-31\pm \sqrt{7172})/40\]

Answer 7

unless you want to bust out fractions we're not factoring this one.

Answer 8

@eseidl agreed

Answer 9

err...
they are using the quadratic formula to define the roots; the factorization then is just:

(x-r1)(x-r2)