Question

If a - 2b + 3c = 0; state the value of
a3 – 863 +27c².​

Answer 1

a + 2b = - 3c ---( 2 )( a + 2b )³ = ( - 3c )³a³ + ( 2b )³ + 3 × a × 2b ( a + 2b ) = - 27c³a³ + 8b³ + 27c³ + 6ab × ( - 3c ) = 0[from ( 2 ) ]a³ + 8b³ + 27c³ - 18abc = 0a³ + 8b³ + 27c³ = 18abcHence proved .I hope this helps you.: )

Answer 2

Answer:

Step-by-step explanation:

a + 2b + 3c = 0 ---( 1 )

a + 2b = - 3c ---( 2 )

( a + 2b )³ = ( - 3c )³

a³ + ( 2b )³ + 3 × a × 2b ( a + 2b ) = - 27c³

a³ + 8b³ + 27c³ + 6ab × ( - 3c ) = 0

[from ( 2 ) ]

a³ + 8b³ + 27c³ - 18abc = 0

a³ + 8b³ + 27c³ = 18abc

Hence proved .

I hope this helps you.

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