🌎 Brought to you by: 🤔 Still stuck in math? Visit to start asking questions. Binomial theorem: ((a+b)^n=a^n+na^(n−1) b+(n(n−1))/2! a^(n−2) b^2+(n(n−1)(n−2))/3! a^(n−3) b^3+…+b^n ) Q. Use the binomial theorem to expand (1+2x−x^2 )^3.