Question

Coefficient of y in the expansion (y-2)^2


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Answer 1

Answer:

1 is the coefficient of y

Answer 2

$(y−2)^2$

$=( \blue{y+−2})( \green{y+−2})$

$= ( \blue{y} ) (\green{y}) + ( \blue{y})(\green{ - 2}) + (\blue{ - 2})(\green{y}) + (\blue{ - 2})(\green{ - 2})$

$= {y}^{2} −2y−2y+4$

$= {y}^{2} - 4y + 4$

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