= 1+9x - 36x2 + 84x3 - 126x4
not sure if the answer should begin with a plus or a minus..
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