Question

solve this:if (x+3) is a factor of (x^2+cx-12) then the value of c is???

Answer 1

Given Equation is x^2 + cx - 12.

Given that x + 3 is a factor of f(x).

= > x + 3 = 0

= > x = -3.

plug x = -3 in f(x), we get

f(-3) = (-3)^2 + c(-3) - 12 = 0

       = 9 - 3c - 12 = 0

       = -3 - 3c = 0

       = -3c = 3

       c = -1.


Therefore the value of c = -1.


Hope this helps!

Answer 2

Hi,

Please see the attached file!


Thanks