Question

If a = -1 , b =-4 find 81 a square + 9 b square - 54 ab​

Answer 1

$a = - 1 \\ b = - 4$

$81 {a}^{2} + 9 {b}^{2} - 54ab$

${(9a)}^{2} + {(3b)}^{2} - 2(9a)(3b)$

${(9a - 3b)}^{2}$

${(9( - 1) - 3( - 4))}^{2}$

${( - 9 + 12)} ^{2}$

${3}^{2}$

$9$

Answer 2

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