Lesson 3-5 Squares and Square Roots Obj: I can find square roots. HWK: p 114 14-45 all Vocab: 1) square root 2) principal square root 3) perfect square root

Every positive number has two square roots – one positive and one negative. Use the symbol ± to indicate both. 16 = 4 - 16 = - 4 so ± 16 = ± 4

Find two square roots of each number Ex 1) 1 Ex 2) 81 Ex 3) 144 Can also be written as 1 and -1 9 and -9 12 and -12

Ex 4) The square computer icon contains 676 pixels Ex 4) The square computer icon contains 676 pixels. How many pixels tall is the icon?

Simplify each expression Ex 5) 3 25 + 4 Ex 6) 16 4 + 1 2

Ex 7) 7 5 −4 + 8 9+16