Question 384681
Break down each term into its prime factors,
{{{5x^5=5^1*x^5}}}
{{{5x=5^1*x^1}}}
{{{-70=-1*2^1*5^1*7^1}}}
They all only have one factor in common.
{{{GCF=5^1}}}
{{{highlight(GCF=5)}}}