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DIRECTIONS: For the following questions write your answer in the given space in the answer sheet. Your answer would be only in single number. Do not write in word. If \[x*y=\sqrt{{{x}^{2}}+{{y}^{2}}},\]the value of \[(1*2\sqrt{2})(1*-2\sqrt{2})\] is _________ *-correct-answer-description-* \[1*2\sqrt{2}=\sqrt{{{(1)}^{2}}+{{(2\sqrt{2})}^{2}}}=\sqrt{1+8}=3\] \[1*-2\sqrt{2}=\sqrt{{{(1)}^{2}}+{{(-2\sqrt{2})}^{2}}}=\sqrt{1+8}=3\] \[\left( 1*2\sqrt{2} \right)\left( 1*-2\sqrt{2} \right)=(3)(3)=9\] *-question-type-* 2 *-question-instructions-* 0

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