Question 1137045
{{{2x^3 + 9x^2 − 12x − 54}}}
<pre>
Factor x² out of the first two terms and -12
out of the last two terms:

{{{x^2(2x+9^"")-6(2x+9^"")}}}

Factor (2x+9) out of those two terms:

{{{(2x+9^"")(x^2-6^"")}}}

To find the zeros, set that = 0

{{{(2x+9^"")(x^2-6)=0}}}

2x+9=0;   x²-6=0
  2x=-9;    x²=6
 {{{x=-9/2}}}   {{{x=""+-sqrt(6)}}}

{{{matrix(1,5,-9/2,",",sqrt(6),",",-sqrt(6))}}}

Edwin</pre>