Answer
4, -7
Work Step by Step
Since the coefficient of the squared term is one, we know that the expression must factor to:
$$ (y\pm a)(y\pm b)$$
Here, we see that a and b must multiply to get $-28$ and add to get $3$. Thus, we find that the solution is:
$$(x+7)(x-4)$$
Thus, setting each factor equal to zero, we find that the solutions are:
$$-7,4$$
