Question

If (2x+5y)^3=8x^3+125y^3+ax^2y+bxy^2,then find the value of b-a

Answer 1

ans is 90 .use Pascal's triangle and ull get the term of x²y as 3*2²*5*x²y. and term of xy² as 3*2*5²xy². then I'll get a as 60 and b as 150.b-a equals 150-60 equals 90