Answer:
Find the square root.
49−−√
49−−√ indicates the positive square root of 49 .
Since 7×7 is 49 , 49−−√=7 .
Find the square root.
−25−−√
−25−−√ indicates the negative square root of 25 .
Since 5×5 is 25 , −25−−√=−5 .
Step-by-step explanation:
Example:
Estimate 69−−√ to the nearest whole number.
First list some perfect squares and look for the whole numbers near 69 .
1, 4, 9, 16, 25, 36, 49, 64, 81, 100, ...
Observe that 69 lies between the perfect squares 64 and 81 . That is, 64<69<81 .
Now find the square root of each number.
64−−√<69−−√<81−−√8<69−−√<9
So, 69−−√ is between 8 and 9 .
Since 69 is much closer to 64 than to 81 , the best whole number estimate is 8 .
