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Home > A2C > Chapter 12 > Lesson 12.4.1 > Problem 12-161

12-161.

Use Pascal's Triangle to expand (x + y)7. Homework Help ✎

Recall Pascal's Triangle.
What row is needed to expand (x + y)7?

Use the pattern for (a + b)7.

a7 + 7a6b + 21a5b2 + 35a4b3 + 35a3b4 + 21a2b5 + 7ab6 + b7

Now substitute x for a and y for b.