The sides of a triangle are $a^{2} - 3 a b + 8$ , $4 a^{2} + 5 a b - 3$ and $6 - 3 a^{2} + 4 a b$ . Then its perimeter is

$a^{2} + 2 a b + 11$

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$2 a^{2} + 6 a b + 11$

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$2 a^{2} + a b + 11$

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$2 a^{2} + 2 a b$

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Solution

The correct option is B
$2 a^{2} + 6 a b + 11$

Sum of the three sides gives the perimeter of the triangle.

i.e. Perimeter = $(a^{2} - 3 a b + 8) + (4 a^{2} + 5 a b - 3) + (6 - 3 a^{2} + 4 a b)$

= $a^{2} + 4 a^{2} - 3 a^{2} - 3 a b + 5 a b + 4 a b + 8 - 3 + 6$

= $2 a^{2} + 6 a b + 11$

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The sides of a triangle are $x^{2} - 3 x y + 8, 4 x^{2} + 5 x y - 3 a n d 6 - 3 x^{2} + 4 x y$ .Find its perimeter.

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