Question 45260
Notice taht 63 can be written as 9*7, and also notice that -9 +7 = -2.  Isn't that an interesting coincidence for this problem!!


So, let's write this {{{x^2 -9x +7x - 63}}} and do factoring by grouping.  Group the first two and take out a common factor of x, and take out a common factor of 7 from the last two terms.
{{{x(x-9) +7(x-9) }}}


Now, there is common factor of x-9, so take out this common factor:
{{{ (x-9)(x+7) }}}


R^2 at SCC