Question

Which of the b values are solutions to the following equation? b^2 = 2.56

Answer 1

Answer:

              b = - 1.6  or   b = 1.6

Step-by-step explanation:

$b^2=2.56\quad\iff\quad b=\pm\sqrt{2.56}\\\\\pm\sqrt{2.56}=\pm\sqrt{256:100}=\pm(\sqrt{256}:\sqrt{100}\,)=\pm(16:10)=\pm1,6$