Write the co- efficient of y in the expansion of ( 5-y)².
manu1121:
when we will open by the property by a2-2ab+b2 coefficient of y will caome -10
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I think It will be -10 because when we write it by (a-b) whole square will be 25-10y+ysquare
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(5-y)^2 = 25+y^2-10y
So coff. of y will be -10
So coff. of y will be -10
Thanks
so mark my answer in brainliest
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