Question 444210
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Hi
{{{12(x+1)^2 + 60(x+1) + 75}}}  Let z = (x+1)
{{{12z^2 + 60z + 75 }}}
{{{z = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{z = (-60 +- sqrt( 0 ))/(24) }}}
   z = -60/24 = -5/2 therefore x = -7/2    (x = z -1)