Add:
3a − 4b + 4c, 2a + 3b − 8c, a − 6b + c

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Solution

Writing the terms of the given expressions (in the same order) in the form of rows with like terms below each other and adding column-wise, we get:

$3 a - 4 b + 4 c 2 a + 3 b - 8 c a - 6 b + c$
___________
$6 a - 7 b - 3 c$

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( 2a + 3b - 4c ) ; ( 8c + 4a - 5b ) and ( 6b + 5c - 2a )

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= 2 (a + 3 b) - 3 (a + 3 b)^{2} [T a k i n g 2 c o m m o n f r o m 2 a + 6 b]

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576 = 2^{a} \times 3^{b} = 24^{c}

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