Question

find the cofficient of y in the expansion of (5-y)power 2​

Answer 1

Answer:

$( 5 - y) { }^{2} = 25 + y {}^{2} - 10y$

The coefficient of y in the expansion is

$\huge{\mathcal{\boxed{\blue{-10}}}}$

Answer 2

Answer:

(5-y)^2

=(5)^2 -2 (5)(y) + y^2

=25 -10 y +y^2

so coefficient of y is -10.