Question 646180
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Hi,
{{{ 4sqrt (18) - 3sqrt (8) }}}
{{{ 4sqrt (9*2) - 3sqrt (4*2) }}} || Note: the factor of 2 in common
{{{ 4*3sqrt (2) - 3*2sqrt (2) }}}       ||Note: {{{sqrt(9) = 3}}} & {{{sqrt(4) = 2}}}
{{{ 12sqrt (2) - 6sqrt (2) }}}
{{{ 6sqrt (2) }}}