Answer:
Step-by-step explanation:
This is a quadratic expression.  Use the quadratic formula to find the roots, and then once you have the roots, write the corresponding factors.
The coefficients of this quadratic expression are a = 7, b = 5 and c = -3
The discriminant is b^2 - 4ac, or 5^ - 4(7)(-3), or 25 + 84 = 109.  Because this is positive, we know that the expression has two unequal, real roots.
Using the quadratic formula, we now find these roots:
       -b ± √(discriminant)
x = --------------------------------   which here is:
                    2a
       -5 ± √109
x = -----------------
              14
The factors can be found from these two roots.  The first one is
       -5 - √109                  5 + √109
(x - ---------------- )  =  (x + ---------------- )
              14                              14
and the second is
         5 - √109               
(x + ---------------- )  
              14