1.8 Binomial Expansion

Question 1

what is pascal’s triangle

Answer 1

Add the adjacent pairs to find the number in the next row
1
1 2 1
1 3 3 1
1 4 6 4 1

Question 2

What is pascal’s triangle used for?

Answer 2

The (n+1)th row gives the coefficients in the expansion of (a + b)^n

Question 3

What is n!

Answer 3

n × (n-1) x (n-2) × … × 3 × 2 × ×1

Question 4

what is factorial notation?

Answer 4

nCr or (n) = n!
(r) ———-
r!(n-r)!

for (a + b)^n
r is the power of b