Question 665927
Starting with
{{{2x^2 - 72 = 0}}}
Factor out 2
2{{{(x^2 - 36) = 0 }}}
...
Now the difference of squares is more easilty seen.
2(x-6)(x+6)=0
x-6=0, so x = 6
x+6=0, so x = -6
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