Subtract 2nd from 1st : $4 a b + 81 b^{2} + 13 a^{2}$ ; $5 a c + 91 b^{2} + 14 a^{2}$

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Solution

$4 a b + 81 b^{2} + 13 a^{2} - [(5 a b) + 97 b^{2} + 14 a^{2}]$
$4 a b + 81 b^{2} + 13 a^{2} - 5 a b + 97 b^{2} + 14 a^{2}$
$4 a b - 5 a b + 81 b^{2} - 97 b^{2} + 13 a^{2} - 14 a^{2}$
$- a b - 16 b^{2} - a^{2}$

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Question 71

Subtract the sum of $12 a b - 10 b^{2} - 18 a^{2}$ and $9 a b + 12 b^{2} + 14 a^{2}$ from the sum of $a b + 2 b^{2}$ and $3 b^{2} - a^{2} .$

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