Find the value off :
$3 a b + 4 b c - 5 c a$ when $a = 4$ , $b = 5$ and $c = - 2$

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Solution

Substituting $a = 4$ , $b = 5$ and $c = - 2$ in the given expression , we get
$3 a b + 4 b c - 5 c a = 3 \times 4 \times 5 + 4 \times 5 \times (- 2) - 5 \times (- 2) \times 4 = 60 - 40 + 40 = 100 - 40 = 60$
Hence,the value of given expression will be $60$ .

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