Question 358017
{{{sqrt(5x+21)=x+3}}}
{{{5x+21=(x+3)^2}}}
{{{5x+21=x^2+6x+9x}}}
{{{x^2+x-12=0}}}
{{{(x+4)(x-3)=0}}}
Two solutions:
{{{x+4=0}}}
{{{highlight(x=-4)}}}
.
.
.
{{{x-3=0}}}
{{{highlight(x=3)}}}