What is 16 * 14?
What is 16 * 14?
Approach: Use (15 - 1)(15 + 1).
224. 225 - 1 = 224.
Follow-up: What is 17 * 13?
Key concepts: difference of squares.
What is 16 * 14?
Approach: Use (15 - 1)(15 + 1).
224. 225 - 1 = 224.
Follow-up: What is 17 * 13?
Key concepts: difference of squares.