Question

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Answer 1

${a}^{2} + {b}^{2} - 5ab$
$= {(a - b)}^{2} - 3ab$
calculate the result of (a-b).It is (-4×6^(1/2)) and the result of ab is 1.
$= {( - 4 \sqrt{6} )}^{2} - 3 \times 1$
$= 96 - 3$
$= 93$



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Answer 2

I hope this answer helps you!!