Question

If $\sqrt{\left(0.49\right)}=x,$ then $x=$ ?

• A. only 0.7
• B. only -0.7
• C. either 0.7 or -0.7
• D. neither 0.7 nor -0.7

Answer 1

The correct option is A only 0.7

The ${}^{\prime \prime }{\sqrt{}}^{\prime \prime }$ symbol always represents the positive square root of a number. Since, $(0.7{)}^2=0.49,\sqrt{\left(0.49\right)}=0.7$.
Hence, $x=0.7$.