Math 9 – Feb 17: 2.2/2.3 Expressing Numbers as Powers

(-3)²  = (-3) x (-3) = +9

-3²  = – (3) x (3) = –9

Brackets change what base is being repeated – be careful with the final sign (+/-) of your answer.

5⁰ = 1

Any non-zero base to the power of zero equals one

Math Journal Entry #2 – Explain how you can predict the sign of a power with a negative base. Give numerical examples to help your explanation.Choose one HW question to solve and explain in your journal.

Homework: pg 56 # 1-5 (a,c,e) 10, 11, 17, 20, 21
Text Section 2.2