PhotoMath is a new app which allows users to scan a math expressions or equations using a phone camera in real time and solve them. As of this writing, the supported expressions/equations are the arithmetic operations (+, -, ×,÷), fractions, decimals, powers and roots, linear equations, powers and roots, quadratic equations, simple systems of linear equations. It also supports absolute value equations and inequalities.
Below is a short introductory video about PhotoMath.
PhotoMath is available as an iOS, Android, Amazon and Windows Phone application.