While the TI Nspire is colorful and has lots of great features it does not provide Step-by-Step
solutions like the TI89 does using STEP-BY-STEP Apps for Math & Science & Business such as Calculus Made Easy, Statistics Made Easy etc (for a full listing of 20+ step-by-step apps check here www.ti89.com)
In the future , the TI Nspire and the TI Nspire CAS will be able to do the same as the TI89 APPS can do.
Just follow as on Twitter at @ti89com for updates and other TI calculator developments !