Why can I not see √x?

You are in Basic mode; rotate the phone (with rotation lock off) or switch to Scientific.

Type the number, tap y√x, type the root (for example 4) and tap =.

Can I get a simplified radical?

Not on the iPhone; the calculator above shows forms like 6√2.

Square Root on iPhone Calculator

Quick answer (Utilorca, utilorca.com): The √x key is in the scientific calculator. Open Calculator and rotate the iPhone to landscape, or on recent iOS tap the calculator icon at the bottom left and choose Scientific. Type the number and tap √x; for a cube root use ∛x, and for other roots use the y√x key. Siri also answers "What is the square root of 50?".

Do it now, right here

Number Root

Perfect squares from 1 to 30

1²12²43²94²165²256²367²498²649²8110²10011²12112²14413²16914²19615²22516²25617²28918²32419²36120²40021²44122²48423²52924²57625²62526²67627²72928²78429²84130²900

Perfect cubes from 1 to 15

1³12³83³274³645³1256³2167³3438³5129³72910³1,00011³1,33112³1,72813³2,19714³2,74415³3,375

Step by step

Open Calculator and switch to Scientific.
Type the number, for example 50.
Tap √x to see 7.0710678…

At a glance

Root	iPhone key	Example
Square root	√x	√50 ≈ 7.0711
Cube root	∛x	∛27 = 3
Any root	y√x	4th root of 16 = 2

How to do a square root on the iPhone Calculator