guys I need urgent help pls end fast it's class 9 maths question
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3.
(x - y/5 + 1) * (x - y/5 - 1 )
{(x - y/5) + 1} * {(x - y/5) - 1}
(a + b) * (a - b) = a*a - b*b
(x - y/5)^2 - (1)^2
x^2 - 2xy/5 + y^2/25 - 1
x^2 + y^2/25 - 2xy/5 - 1 ans.
4. dont know
sorry
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