Ch.5sec7
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Redwood2nd
Chapter5section7
SquareRoots
Numberx 2 squareofanumber
2
81isthesquareofthenumber9
9 =9•9
Since92 =81 81squareofthenumber9
9squarerootofthenumber81
radicalnotation
9 = 3 − 9 = −3 9 nonnegative(positiveorzero)squarerootof9
- 9 negativesquarerootof9
radical
number-radicand
( −3)
2
= 9 2
3 = 9 -3,3squarerootof9sothe3(positivevalue)iscalledtheprincipal
squareroot
Try:
a) 16 b) 81 Orderofoperations:
1)groupingsymbols
2)exponents,radicals
a)−3 9 +12 4 c) 100 b)−2− 3 36 c) 9+16 Estimatesquareroots.
24 isbetweenwhichtwoconsecutivewholenumbers?
Whichwholenumberiscloser?
Approximatethedecimal.
58 isbetweenwhichtwoconsecutivewholenumbers?
Whichwholenumberiscloser?
Approximatethedecimal.
d)- 36 e)− 121 4
d) 9 + 16 e)
9