(1-x)9
= 1+9x - 36x2 + 84x3 - 126x4
not sure if the answer should begin with a plus or a minus..
please clarify
thanks
yep i mean but dont know how to do the signs on my keyboard)
thanks for that so is this correct now??:
= 1+9x + 36x2 + 84x3 + 126x4
despite having the result, what method would you use to get to the result as the method I used was the same as method I would use if calculating (1+x)7 any ideas?
thanks for your guidance
What you did was wrong because must contain 9th power.
You might use this to learn about yourself
Binomial theorem
Therefore, the answer should be: