Complete the expansion of k 8 4 Use before exponents x2 would be written as x 2 Step 1 Determine the binomial coefficients from row 4 of Pascal s Triangle Step 2 Write each a term and each b term in parenthesis after the coefficients 1 k 8 4 k 8 1 k 8 Step 3 Assign exponents Step 4 Simplify each term to each term 4 k 3 8 1 6 k 2 8 2 1 k 8 4 4 1