Answer:
Between -12 and -13, decimal estimate: -12.2
Step-by-step explanation:
First let's disregard the negative sign, and focus on . The smallest square below it is , or 144. The greatest square right above it is , or 169.
Now we know that is somewhere between 12 and 13. Likewise is between -12 and -13. If 12.5 is the square root of 150, it is too high, so we reduce it to 12.2 to 12.3.
Then we can just negate our answer, since we are looking for , to get about -12.2.