Question 1744
1. {{{6z^2-12z+30}}}

{{{6(z^2-2z+5)}}}
{{{6(z^2-2z+1+4)}}}
{{{6((z-1)^2 + 4)}}}

2. {{{3x^2+21x+27}}}
{{{3(x^2+7x+9)}}}
{{{3(x^2+7x+(49/4)-(13/4))}}}
{{{3((x+(7/2))^2 - (13/4))}}}

3. {{{16x^4-1}}}
{{{(4x^2)^2 - 1^2}}}
{{{(4x^2 + 1)(4x^2 - 1)}}}

cheers
Jon.