Question

Question #423d5

Answer 1

`+-9/2`

Explanation:

`20 1/4=81/4`

`rArrsqrt(20 1/4)=sqrt(81/4)`

`rArrsqrt(81/4)=+-9/2larrcolor(blue)"note plus or minus"`

`[9/2xx9/2=81/4" and "-9/2xx-9/2=81/4]`