Question 295760
{{{(2x-1)^2=20}}} show full problem
{{{(2x-1)(2x-1)=20}}}foil
{{{4x^2-2x-2x+1=20}}} add like terms
{{{4x^2-4x+1=20}}} subtract 20
{{{4x^2-4x-19=0}}}
use quadratic formula
*[invoke quadratic "x", 4, -4, -19]