Question 89097
{{{ x^2 + 3x - 28}}}
The thing to notice is that certain factors of 28 are 4 and 7. Also,
the difference between them is {{{7 - 4 = 3}}}. From this I get
{{{(x + 7)(x - 4)}}}. You just have to get the + and - signs right
If the problem was  {{{x^2 - 3x - 28}}}, then the answer would be
{{{(x - 7)(x + 4)}}}