Question 978023
{{{ 2(x+3)^2 = (sqrt(2)(x+3))^2 }}}
{{{ 10 = (sqrt(10))^2 }}}

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{{{ 2(x+3)^2-10 = (sqrt(2)(x+3))^2 - (sqrt(10))^2 }}}
{{{ 2(x+3)^2-10 = (sqrt(2)(x+3) - sqrt(10))(sqrt(2)(x+3) + sqrt(10)) }}}
{{{ 2(x+3)^2-10 = (sqrt(2)(x+3) - sqrt(2*5))(sqrt(2)(x+3) + sqrt(2*5)) }}}
{{{ 2(x+3)^2-10 = (sqrt(2)(x+3) - sqrt(2)*sqrt(5))(sqrt(2)(x+3) + sqrt(2)*sqrt(5)) }}}
{{{ 2(x+3)^2-10 = sqrt(2)((x+3) - sqrt(5))*sqrt(2)((x+3) + sqrt(5)) }}}
{{{ 2(x+3)^2-10 = sqrt(2)*sqrt(2)((x+3) - sqrt(5))((x+3) + sqrt(5)) }}}
{{{ 2(x+3)^2-10 = 2((x+3) - sqrt(5))((x+3) + sqrt(5)) }}}


Hopefully that helps. If not, then let me know.