SOLUTION: For which equation is it best to use the Factoring Method to solve this trinomial? A.) {{{ x^2 + 4x = -5 }}} B.) {{{ 3x^2 + 2.4x - 3 = 0 }}} C.) {{{ x^2 - 4x + 3 = 0 }}

Algebra ->  Test -> SOLUTION: For which equation is it best to use the Factoring Method to solve this trinomial? A.) {{{ x^2 + 4x = -5 }}} B.) {{{ 3x^2 + 2.4x - 3 = 0 }}} C.) {{{ x^2 - 4x + 3 = 0 }}      Log On


   

Question 1031991: For which equation is it best to use the Factoring Method to solve this trinomial?

A.) +x%5E2+%2B+4x+=+-5+

B.) +3x%5E2+%2B+2.4x+-+3+=+0+
C.) +x%5E2+-+4x+%2B+3+=+0+
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Clearly not B, because of the x^2 preceded by 3 (not a problem) but the middle term of 2.4.
A is prime, because if we complete the square, we have x^2+4x+4=-5+4, and that is (x+2)^2= -1, and x+2=+/- sqrt (-1)
C factors into (x-3)(x-1)=0. It is C.