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Home > PC > Chapter 7 > Lesson 7.3.3 > Problem 7-121

7-121.

Use Pascal’s triangle to expand . Hint: Expand and then substitute the for and for .

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.

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