CPM Homework Help : PC Problem 7-121

Use Pascal’s triangle to expand $(a + bc)^4$ . Hint: Expand $(x + y)^4$ and then substitute the $a$ for $x$ and $bc$ for $y$ .

Hint:

Use Pascal's triangle to get the coefficients quickly.

5 rows of numbers arranged in triangular array, as follows: top row, number 1, next row, numbers 1 & 1, next row, numbers 1, 2, & 1, next row, numbers 1, 3, 3, & 1, bottom row, numbers 1, 4, 6, 4, & 1.

More Help:

Substitute $(bc)$ for $y$ with the ( ).
You will make fewer careless errors!