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cc104567Best ResponseYou've already chosen the best response.0
\[a^{2}+b ^{2}=c ^{2}\] \[15^{2}+\left( x+6 \right)^{2}=x ^{2}\] use foil
 2 years ago

lcf1999Best ResponseYou've already chosen the best response.0
those lines there mean that the two sides are congruent and x would be 15 and 15 plus 6 is 21 so the answer is 21.
 2 years ago
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