Published by admin on September 15, 2020 A slight variant on method ##color(blue)(Vertex ->(xy)->(2-1)## Given:## 2x^2-8x+7## Write as:## 2(x^2-color(red)(8/2)x)+7## Consider the ##color(red)(-8/2) from -8/2x## ##color(blue)(x_(vertex)=(-1/2)xx(color(red)(-8/2)) = +8/4 = 2)## ‘~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Substitute ##x=color(magenta)(2)## in […]