Break out the slide rule... just kidding. √5 is between √4 and √9 which are 2 and 3 respectively. It is closer to √4 so you can approximate the decimal as about 2.24
8(2.24) = 8(2 + .24) = 16 + 1.92 = 17.92
It's not the answer in the book, but it's close enough having guessed.
Answers & Comments
Verified answer
Break out the slide rule... just kidding. √5 is between √4 and √9 which are 2 and 3 respectively. It is closer to √4 so you can approximate the decimal as about 2.24
8(2.24) = 8(2 + .24) = 16 + 1.92 = 17.92
It's not the answer in the book, but it's close enough having guessed.
if you find â5 which is about 2.23607
2.23607*8=17.88854
which is about 17.89
btw use a calculator to find â5