Question 33809
Solve by factoring:
{{{5x^2+8x-21 = 0}}} Factor.
{{{(5x -7)(x+3) = 0}}} Apply the zero products principle.
{{{5x-7 = 0}}} and/or {{{x+3 = 0}}}
If {{{5x-7 = 0}}} then {{{5x = 7}}} and {{{x = 7/5}}}
If {{{x+3 = 0}}} then {{{x = -3}}}

The roots are:
{{{x = 7/5}}}
{{{x = -3}}}