Chapter 4 Quadratic Functions and Factoring - 4.3 Solve x(squared) + bx + c = 0 - Guided Practice for Example 1 - Page 252: 3

$$(r+9)(r-7)$$

Since the coefficient of the squared term is one, we know that the expression must factor to: $$ (r\pm a)(r\pm b)$$ Here, we see that a and b must multiply to get $-63$ and add to get $2$. Thus, we find that the solution is: $$(r+9)(r-7)$$