Chapter 4 Quadratic Functions and Factoring - 4.3 Solve x(squared) + bx + c = 0 - 4.3 Exercises - Skill Practice - Page 256: 34

8,-10

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 $-80$ and add to get $2$. Thus, we find that the solution is: $$(r+10)(r-8)$$ Thus, setting each factor equal to zero, we find that the solutions are: $$8,-10$$