Find the first four terms in the binomial expansion (x-7)^12

Answer 1

12C0 x^12 (-7)^0 + 12C1 x^11 (-7)^1 + 12C2 x^10 (-7)^2 + 12C3 x^9 (-7)^3 + ...

x^12 - 84x^11 + 3234x^10 - 75460x^9 + ...