Question

write the coefficient of y in the expansion of (5-y ) square

Answer 1

Answer:

Step-by-step explanation

(5-y)^2

=(5)^2 - 2×(5)×(y) + (y)^2 ____(a - b)^2 = a^2 -2ab +b^2

=25-10y+y^2.

Answer 2

Answer:

Coefficient of y is 10

Step-by-step explanation:

(5-y)² = 5²+y²-2×5×y

/* By algebraic identity:

(a-b)² = a²+b²-2ab */

= 25+y²-10y

Coefficient of y² is 1

coefficient of y is 10

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