Casio CLASSPAD 330 3.04 - Manual (Page 236)

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Using Verify
(4) Following the equal sign (=), input 25 s 3 and tap U.
(5) Tap [OK] to close the error dialog that appears.
(6) Change 25 s 3 to 25 s 2 and tap U.
(7) Following the next equal sign (=), input 5 s 5 s 2 and
tap U.
Example 2: To rewrite x 2 + 1 in factored form
(1) Tap the left most toolbar icon to begin a new Verify session.
(2) Tap [OK] to clear the window.
(3) Tap the down arrow on the toolbar and select .
(4) Input x ^2 + 1 and press .
(5) Input ( x + i )( x – i ) and press .