Question

find by inspection the coefficient of X in the following expansions ​

Answer 1

Answer:

-8 or 5

Step-by-step explanation:

( 5 - x )( x + 8)

5x + 40 - x² - 8x = 0

40 - x² - 3x = 0

x² + 3x - 40 = 0

x² + 8x - 5x - 40 = 0

x( x + 8) - 5( x + 8) = 0

( x+ 8)( x - 5) = 0

x = -8 or x = 5

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