Write the coefficient of y in the expansion (5-y)²
psushil2003:
-10
Answers
Answered by
5
-10 is coefficient of y
Thank you
how?
welcm
aree see:according to (a-b)^2=a^2-2ab+b^2. so it will become:25-10y+y^2
(5-y)²=5²-2(5)(y)+y²=25-10y+y² therefore y has a coefficient of -10
hey how did u bring the sq. @kajalsingh
oh !
yeah.
Just hold the number 2 and a small ² with a small ⅔ will appear u can do the same for other numbers also like ³,⁴⅜etc
thanku
Answered by
17
Answer:
Step-by-step explanation:
we know (a-b)^2 = a^2 - 2ab +b^2
given (5-y)^2 = 5^2 - 2*5*y + y^2
= 25 - 10y + y^2
we can observe that -10 is multiplied with y
hence -10 is the co-efficient of y
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