Simplify :- ( 3a - 5b +4c ) ( 7a + 9b -8c ) and find the value at a = 1 ,

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December 2023 1 7 Report

Simplify :- ( 3a - 5b +4c ) ( 7a + 9b -8c ) and find the value at a = 1 , b = -1 , c = 2
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xiwang

[tex]卂几丂山乇尺:[/tex]

The simplified expression is
[tex](21a^2 - 36ab - 47ac + 45b^2 + 26bc - 32c^2). [/tex]
When (a = 1, b = -1, c = 2), the value is
[tex](21 - 36 + 94 + 45 - 52 - 128 = -56).[/tex]

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