Question 164459
{{{-7* sqrt (242)}}}

replace 242 with 121*2

{{{-7* sqrt (121*2)}}}
Split into 2 square roots

{{{-7* sqrt (121)*sqrt(2)}}}

Simplify {{{sqrt(121)}}} : it's =11

{{{-7* 11*sqrt(2)}}}

which equals

{{{-77*sqrt(2)}}}

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