If $a = 3, b = - 5 a n d c = 3$ , find the value of
$3 a b + 2 b c - 3 c a$

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Solution

Finding the value of the algebraic expression
Substituting $a = 3, b = - 5 a n d c = 3$ in the expression $3 a b + 2 b c - 3 c a$ ,we get
$3 a b + 2 b c - 3 c a = 3 (3) (- 5) + 2 (- 5) (3) - 3 (3) (3) = (- 45) + (- 30) - 27 = - 75 - 27 = - 102$
Hence, the value of the given algebraic expression at $a = 3, b = - 5 a n d c = 3$ is $- 102$

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