I see an expression "x5x4" and I suspect that the intended entry is "x^5x^4", so using exponents. 

Type the problem as if you were typing it into an email, but for exponentials, enter the '^' (Shift+6) symbol, so "x squared" would be entered as "x^2".

The '^' symbol (Shift+6) can be used to enter "x^5" and (then use the "right arrow" key or a click of the mouse to exit the exponent region and continue typing).