5*4^(x^2+4 x)+20*10^(x^2+4 x-1)-7*25^(x^2+4 x)=0,-1<=x<=3

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.